SquareForm™ — Drill Dead-Square Mortise Holes That Lock Tenons Tight
Drill Dead-Square Mortise Holes — No Chisel Cleanup, No Wonky Walls
Pulling tight, professional mortise-and-tenon joints out of pine, MDF, or hardwood doesn't have to mean an hour of chiseling for every hole. The SquareForm™ Precision Drill Set bores clean, square-walled mortises in a single plunge — your tenons drop in flush, the joint locks without rocking, and Saturday's project actually gets done on Saturday.
Stop Spending Saturday Chiseling One Wonky Mortise
A round drill bit leaves a circle. A circle isn't a mortise. So you reach for the chisel, square the corners by hand, and twenty minutes later the wall still isn't true. Your tenon rocks, the glue line shows, and the build that was supposed to take an afternoon eats your whole weekend.
➤ Bores square the first time: The hollow chisel sleeve cuts the four flat walls while the auger inside clears the chip — one plunge gives you a true square hole, no follow-up paring with a hand chisel.
➤ Built for real wood, not metal: Sized for pine, MDF, particleboard, linden, and most furniture-grade hardwoods — the cutting geometry is tuned for wood fiber, not steel or plastic.
➤ Sharp out of the box: Each chisel ships ground and ready to cut — no honing on a wet stone before your first hole, no gritty edges curled over from rough manufacturing.
Meet SquareForm™: A Hollow Chisel + Auger That Cut as One
Each bit is two tools nested into one. The outer hollow chisel is a four-walled steel sleeve sharpened to a square edge; the auger inside spins to clear the waste while the chisel pares the corners flush. Your mortising machine forces them down together — round chip out the side, dead-square hole left behind.
A milled, true-round shaft seats cleanly in the bushing of your mortising machine or drill press attachment, so the bit doesn't wobble and the corners stay clean from hole one to hole one hundred. This is the same hollow-chisel principle pro shops have used for a century — sized for benchtop machines.
What Woodworkers Are Saying After the First Cabinet Run
'Bought these expecting to grind the edges before I could use them — half my Amazon mortise bits arrive that way. These were sharp out of the box. Cut twenty 3/8" mortises for a tool cabinet on a Sunday morning, every tenon tapped in flush.' – Keith B.
Why Your Joinery Will Look Different Starting With This Set
✓ Square holes in one plunge: Drop the lever, pull it back up, move on — no clean-up chiseling between every hole.
✓ Joints that don't rock: Flat, true walls let your tenon sit flush — no shimming, no gap-filler glue, no joint creak after a season.
✓ Hardened steel that holds an edge: Through a full furniture build, the cutting edges stay sharp enough to make the last mortise look like the first.
Set It Up Once — Then Just Drill
Step 1: Glove up. The chisel edges are sharp out of the box — handle them like you would a freshly ground plane iron.
Step 2: Seat the bit. The shaft slides into your mortise machine's bushing; the chisel sleeve clamps to the spindle housing. Snug everything down before you power on.
Step 3: Set the bit-to-chisel gap. A 0.02–0.04" shim (a credit card works) between the auger tip and the chisel face gives the chip somewhere to go and stops the bit from binding mid-cut.
| SquareForm™ | Round Bit + Hand Chisel | Mallet & Bench Chisel |
|---|---|---|
| True-square walls in one plunge | ❌ | ❌ |
| Cuts 20+ mortises in an afternoon | ❌ | ❌ |
| Hardened edge holds through a full build | ❌ | ❌ |
Specs Built for Bench-Top Mortising Machines
- Material: Carbon steel construction with ground cutting edges and a milled true-round shaft
- Cutting Sizes Available: 4-piece set (¼", 5/16", 3/8", ½") or 6-piece set (adds 9/16" and 5/8")
- What's Included: One bit per size — hollow chisel sleeve and auger nested as a single assembly
- Compatible With: Bench-top mortising machines and drill presses fitted with a mortising attachment — not for handheld drills
Your Questions, Honestly Answered
Will these work in my regular drill or bare drill press?
No — and this is the most important thing to know before ordering. SquareForm™ bits need a mortising machine, or a drill press fitted with a mortising attachment that holds the chisel sleeve square to the work. They will not chuck into a hand drill or a bare drill press.
Are they sharp out of the box?
Yes. The chisel walls and the auger arrive ground and ready to cut — no pre-honing, no diamond-stone session before your first joint.
What woods will they cut cleanly?
Pine, MDF, particleboard, linden, and most furniture-grade hardwoods like oak and maple. Don't use them on metal, glass, plastic, or concrete — those will chip the chisel walls.
How do I keep the bit from binding mid-cut?
Set a 0.02–0.04" gap between the auger tip and the inside face of the chisel — about the thickness of a credit card. The gap gives the chip a path out the side and stops the auger from grabbing the chisel wall.
Do I need a lot of experience to get clean holes?
No. Clamp your stock, set the depth stop, pull the lever — the geometry of the hollow chisel does the squaring. After two or three test holes in scrap, your production mortises will look identical.
Make Tight Mortises Your New Default
SquareForm™ doesn't make you a better woodworker — it just stops the chisel cleanup from eating the part of the build you actually like. Drop a set on the bench, set up your mortiser once, and turn out true mortise-and-tenon joints the way the trade has cut them for a hundred years.
Drill Dead-Square Mortise Holes — No Chisel Cleanup, No Wonky Walls
Pulling tight, professional mortise-and-tenon joints out of pine, MDF, or hardwood doesn't have to mean an hour of chiseling for every hole. The SquareForm™ Precision Drill Set bores clean, square-walled mortises in a single plunge — your tenons drop in flush, the joint locks without rocking, and Saturday's project actually gets done on Saturday.
Stop Spending Saturday Chiseling One Wonky Mortise
A round drill bit leaves a circle. A circle isn't a mortise. So you reach for the chisel, square the corners by hand, and twenty minutes later the wall still isn't true. Your tenon rocks, the glue line shows, and the build that was supposed to take an afternoon eats your whole weekend.
➤ Bores square the first time: The hollow chisel sleeve cuts the four flat walls while the auger inside clears the chip — one plunge gives you a true square hole, no follow-up paring with a hand chisel.
➤ Built for real wood, not metal: Sized for pine, MDF, particleboard, linden, and most furniture-grade hardwoods — the cutting geometry is tuned for wood fiber, not steel or plastic.
➤ Sharp out of the box: Each chisel ships ground and ready to cut — no honing on a wet stone before your first hole, no gritty edges curled over from rough manufacturing.
Meet SquareForm™: A Hollow Chisel + Auger That Cut as One
Each bit is two tools nested into one. The outer hollow chisel is a four-walled steel sleeve sharpened to a square edge; the auger inside spins to clear the waste while the chisel pares the corners flush. Your mortising machine forces them down together — round chip out the side, dead-square hole left behind.
A milled, true-round shaft seats cleanly in the bushing of your mortising machine or drill press attachment, so the bit doesn't wobble and the corners stay clean from hole one to hole one hundred. This is the same hollow-chisel principle pro shops have used for a century — sized for benchtop machines.
What Woodworkers Are Saying After the First Cabinet Run
'Bought these expecting to grind the edges before I could use them — half my Amazon mortise bits arrive that way. These were sharp out of the box. Cut twenty 3/8" mortises for a tool cabinet on a Sunday morning, every tenon tapped in flush.' – Keith B.
Why Your Joinery Will Look Different Starting With This Set
✓ Square holes in one plunge: Drop the lever, pull it back up, move on — no clean-up chiseling between every hole.
✓ Joints that don't rock: Flat, true walls let your tenon sit flush — no shimming, no gap-filler glue, no joint creak after a season.
✓ Hardened steel that holds an edge: Through a full furniture build, the cutting edges stay sharp enough to make the last mortise look like the first.
Set It Up Once — Then Just Drill
Step 1: Glove up. The chisel edges are sharp out of the box — handle them like you would a freshly ground plane iron.
Step 2: Seat the bit. The shaft slides into your mortise machine's bushing; the chisel sleeve clamps to the spindle housing. Snug everything down before you power on.
Step 3: Set the bit-to-chisel gap. A 0.02–0.04" shim (a credit card works) between the auger tip and the chisel face gives the chip somewhere to go and stops the bit from binding mid-cut.
| SquareForm™ | Round Bit + Hand Chisel | Mallet & Bench Chisel |
|---|---|---|
| True-square walls in one plunge | ❌ | ❌ |
| Cuts 20+ mortises in an afternoon | ❌ | ❌ |
| Hardened edge holds through a full build | ❌ | ❌ |
Specs Built for Bench-Top Mortising Machines
- Material: Carbon steel construction with ground cutting edges and a milled true-round shaft
- Cutting Sizes Available: 4-piece set (¼", 5/16", 3/8", ½") or 6-piece set (adds 9/16" and 5/8")
- What's Included: One bit per size — hollow chisel sleeve and auger nested as a single assembly
- Compatible With: Bench-top mortising machines and drill presses fitted with a mortising attachment — not for handheld drills
Your Questions, Honestly Answered
Will these work in my regular drill or bare drill press?
No — and this is the most important thing to know before ordering. SquareForm™ bits need a mortising machine, or a drill press fitted with a mortising attachment that holds the chisel sleeve square to the work. They will not chuck into a hand drill or a bare drill press.
Are they sharp out of the box?
Yes. The chisel walls and the auger arrive ground and ready to cut — no pre-honing, no diamond-stone session before your first joint.
What woods will they cut cleanly?
Pine, MDF, particleboard, linden, and most furniture-grade hardwoods like oak and maple. Don't use them on metal, glass, plastic, or concrete — those will chip the chisel walls.
How do I keep the bit from binding mid-cut?
Set a 0.02–0.04" gap between the auger tip and the inside face of the chisel — about the thickness of a credit card. The gap gives the chip a path out the side and stops the auger from grabbing the chisel wall.
Do I need a lot of experience to get clean holes?
No. Clamp your stock, set the depth stop, pull the lever — the geometry of the hollow chisel does the squaring. After two or three test holes in scrap, your production mortises will look identical.
Make Tight Mortises Your New Default
SquareForm™ doesn't make you a better woodworker — it just stops the chisel cleanup from eating the part of the build you actually like. Drop a set on the bench, set up your mortiser once, and turn out true mortise-and-tenon joints the way the trade has cut them for a hundred years.
Original: $29.99
-70%$29.99
$9.00Description
Drill Dead-Square Mortise Holes — No Chisel Cleanup, No Wonky Walls
Pulling tight, professional mortise-and-tenon joints out of pine, MDF, or hardwood doesn't have to mean an hour of chiseling for every hole. The SquareForm™ Precision Drill Set bores clean, square-walled mortises in a single plunge — your tenons drop in flush, the joint locks without rocking, and Saturday's project actually gets done on Saturday.
Stop Spending Saturday Chiseling One Wonky Mortise
A round drill bit leaves a circle. A circle isn't a mortise. So you reach for the chisel, square the corners by hand, and twenty minutes later the wall still isn't true. Your tenon rocks, the glue line shows, and the build that was supposed to take an afternoon eats your whole weekend.
➤ Bores square the first time: The hollow chisel sleeve cuts the four flat walls while the auger inside clears the chip — one plunge gives you a true square hole, no follow-up paring with a hand chisel.
➤ Built for real wood, not metal: Sized for pine, MDF, particleboard, linden, and most furniture-grade hardwoods — the cutting geometry is tuned for wood fiber, not steel or plastic.
➤ Sharp out of the box: Each chisel ships ground and ready to cut — no honing on a wet stone before your first hole, no gritty edges curled over from rough manufacturing.
Meet SquareForm™: A Hollow Chisel + Auger That Cut as One
Each bit is two tools nested into one. The outer hollow chisel is a four-walled steel sleeve sharpened to a square edge; the auger inside spins to clear the waste while the chisel pares the corners flush. Your mortising machine forces them down together — round chip out the side, dead-square hole left behind.
A milled, true-round shaft seats cleanly in the bushing of your mortising machine or drill press attachment, so the bit doesn't wobble and the corners stay clean from hole one to hole one hundred. This is the same hollow-chisel principle pro shops have used for a century — sized for benchtop machines.
What Woodworkers Are Saying After the First Cabinet Run
'Bought these expecting to grind the edges before I could use them — half my Amazon mortise bits arrive that way. These were sharp out of the box. Cut twenty 3/8" mortises for a tool cabinet on a Sunday morning, every tenon tapped in flush.' – Keith B.
Why Your Joinery Will Look Different Starting With This Set
✓ Square holes in one plunge: Drop the lever, pull it back up, move on — no clean-up chiseling between every hole.
✓ Joints that don't rock: Flat, true walls let your tenon sit flush — no shimming, no gap-filler glue, no joint creak after a season.
✓ Hardened steel that holds an edge: Through a full furniture build, the cutting edges stay sharp enough to make the last mortise look like the first.
Set It Up Once — Then Just Drill
Step 1: Glove up. The chisel edges are sharp out of the box — handle them like you would a freshly ground plane iron.
Step 2: Seat the bit. The shaft slides into your mortise machine's bushing; the chisel sleeve clamps to the spindle housing. Snug everything down before you power on.
Step 3: Set the bit-to-chisel gap. A 0.02–0.04" shim (a credit card works) between the auger tip and the chisel face gives the chip somewhere to go and stops the bit from binding mid-cut.
| SquareForm™ | Round Bit + Hand Chisel | Mallet & Bench Chisel |
|---|---|---|
| True-square walls in one plunge | ❌ | ❌ |
| Cuts 20+ mortises in an afternoon | ❌ | ❌ |
| Hardened edge holds through a full build | ❌ | ❌ |
Specs Built for Bench-Top Mortising Machines
- Material: Carbon steel construction with ground cutting edges and a milled true-round shaft
- Cutting Sizes Available: 4-piece set (¼", 5/16", 3/8", ½") or 6-piece set (adds 9/16" and 5/8")
- What's Included: One bit per size — hollow chisel sleeve and auger nested as a single assembly
- Compatible With: Bench-top mortising machines and drill presses fitted with a mortising attachment — not for handheld drills
Your Questions, Honestly Answered
Will these work in my regular drill or bare drill press?
No — and this is the most important thing to know before ordering. SquareForm™ bits need a mortising machine, or a drill press fitted with a mortising attachment that holds the chisel sleeve square to the work. They will not chuck into a hand drill or a bare drill press.
Are they sharp out of the box?
Yes. The chisel walls and the auger arrive ground and ready to cut — no pre-honing, no diamond-stone session before your first joint.
What woods will they cut cleanly?
Pine, MDF, particleboard, linden, and most furniture-grade hardwoods like oak and maple. Don't use them on metal, glass, plastic, or concrete — those will chip the chisel walls.
How do I keep the bit from binding mid-cut?
Set a 0.02–0.04" gap between the auger tip and the inside face of the chisel — about the thickness of a credit card. The gap gives the chip a path out the side and stops the auger from grabbing the chisel wall.
Do I need a lot of experience to get clean holes?
No. Clamp your stock, set the depth stop, pull the lever — the geometry of the hollow chisel does the squaring. After two or three test holes in scrap, your production mortises will look identical.
Make Tight Mortises Your New Default
SquareForm™ doesn't make you a better woodworker — it just stops the chisel cleanup from eating the part of the build you actually like. Drop a set on the bench, set up your mortiser once, and turn out true mortise-and-tenon joints the way the trade has cut them for a hundred years.
