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Cut clean square holes with the drill you already own. A hollow square chisel with a spiral auger inside: the auger clears the waste while the four sharp edges square the corners – ideal for mortise-and-tenon joints, furniture and DIY woodworking.
Good to know: square holes need steady downward pressure – a drill stand or drill press gives the cleanest results. Work in passes on deep holes and let the auger clear the chips.
In the box: 4 × square hole chisel bits with augers, 1 × drill bracket.
Orders are processed within 1–3 business days. Estimated delivery: 7–15 business days after shipping. Free standard shipping on orders over $49 (US). A tracking number is emailed once your order ships.
Not happy? You have 14 days after receiving your item to request a return. Items must be unused and in original packaging. Contact support@avichome.com to start a return.
Square holes · clean corners. Mortise & tenon made easy. 4 sizes 1/4"–1/2". Bracket included. High-carbon steel.
The hollow chisel squares the corners while the auger clears the waste – in one plunge.
Four sharpened edges leave crisp, straight walls for tight-fitting joints.
The included bracket lets you use a hand drill or a household drill stand.
Slide the auger through the hollow chisel and clamp both in the bracket on your drill.
Mark the mortise and clamp the workpiece firmly.
Press straight down with steady pressure – the auger lifts the chips out the side slot.
Overlap plunges to cut a long mortise, then square up the ends.
With the included bracket for straight, steady plunges.
Best results – steady, square and repeatable.
The chisels also fit dedicated mortisers.
Softwoods and hardwoods – take lighter passes in hardwood.
Slow, and hard to keep the walls straight and square.
Leaves rounded corners you still have to clean up by hand.
Square holes with clean corners in one plunge.
Mortise-and-tenon joints for tables, chairs and benches.
Strong, hidden joints without metal brackets.
Square slots for rails, latches and hardware.
Square pegs, slots and decorative cut-outs.
For the cleanest results use a drill stand or drill press and clamp the workpiece.
6.4 mm (1/4"), 8 mm (5/16"), 9.5 mm (3/8"), 12.7 mm (1/2")
Hollow square chisel with spiral auger
High-carbon steel
approx. 177–210 mm depending on size
Hand drill + bracket, drill stand, drill press or mortiser
4 × chisel bits with augers, 1 × drill bracket
Turned my standard drill press into a mortising machine for clean cabinet joints.
Use Case:I used this adapter set while building a custom set of oak kitchen cabinets and two matching end tables. I put it through a real world stress test by cutting thirty consecutive deep mortises in seasoned hardwood to see if the bits would overheat...
Based on 10 reviews
they work well but I found out that if you drill the first hole with the drill bit first and then add the square cutter it cuts easier tried to use both but it pushed very hard to get through what you're drilling
Good quality, will buy again
Use Case:I used this adapter set while building a custom set of oak kitchen cabinets and two matching end tables. I put it through a real world stress test by cutting thirty consecutive deep mortises in seasoned hardwood to see if the bits would overheat or drift.Pros and Cons:Cast components feel heavy and solid enough for professional shop use.Setup was intuitive and I had it aligned on my press in under five minutes.Cutting edges stayed sharp even after a full day of drilling through dense oak.Versatile enough for a beginner but precise enough for furniture grade work.Consideration: The set arrives in basic cardboard so you will need to find a dedicated drawer or build a rack since it lacks a storage case.Final Verdict:Best for DIY woodworkers who need repeatable square holes without the cost of a dedicated mortiser.
Works like it should
Mortising attachment adapter with a four-piece square hole drill bit set for drill presses and hand drills in woodworking projects. It is for making square holes without turning the shop into a full-time chisel rehab center.The adapter gives you a cleaner mortising workflow than trying to fake it by hand on every hole. Secure the setup well and cut progressively, because square hole work is unforgiving when the workpiece starts wandering.
Very good I will recommend to anyone
This drill bit work and did what I wanted it to do. Easy to use and I will need to order some smaller ones for a future project.
Bought items for improvement of woodworking projects, they work as they should
Works great and makes nice work of mortise and tenon joints
perfect as ordered good quality
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