Cuts a nice square
It's Sharp
Avichome
Square Hole Chisel Bit Set – 4 pcs
Square Hole Chisel Bit Set – 4 pcs
Regular price
$45.00
Regular price
$79.00
Sale price
$45.00
Shipping calculated at checkout.
- 4 sizes: 1/4", 5/16", 3/8", 1/2"
- High-carbon steel chisels with spiral augers
- Fits the Mortise Drill Kit bracket
- Spare set – keep cutting while one set is sharpened
Quantity
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Product Details
Product Details
A second set of square hole chisels – keep a spare set for the shop, or replace bits as they wear.
- 4 sizes: 6.4 mm (1/4"), 8 mm (5/16"), 9.5 mm (3/8"), 12.7 mm (1/2").
- High-carbon steel hollow chisel with spiral auger.
- Fits the Square Hole Mortise Drill Kit bracket and mortising machines.
In the box: 4 × square hole chisel bits with augers (bracket not included).
Shipping
Shipping
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.
Returns & Refunds
Returns & Refunds
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.
Spare set of 4 chisels. 4 sizes 1/4"–1/2". High-carbon steel. Fits the Mortise Kit bracket. Square holes · clean corners.
Keep cutting clean squares
Bits getting dull?
Swap in a fresh set and keep the corners crisp instead of forcing a worn chisel through hardwood.
Need two sizes on the bench?
Leave one size set up in the bracket and the next one ready – no stopping to change bits mid-project.
Sharing the shop?
A second set means two people can cut mortises at the same time.
How it works
1
Fit the bit
Slide the auger through the hollow chisel and clamp both in the bracket on your drill.
2
Mark & clamp
Mark the mortise and clamp the workpiece firmly.
3
Plunge
Press straight down with steady pressure – the auger lifts the chips out the side slot.
4
Step along
Overlap plunges to cut a long mortise, then square up the ends.
Fits the setup you use
Hand drill
With the included bracket for straight, steady plunges.
Drill stand / drill press
Best results – steady, square and repeatable.
Mortising machine
The chisels also fit dedicated mortisers.
Any wood
Softwoods and hardwoods – take lighter passes in hardwood.
Why it beats the old way
✕ Chisel & mallet
Slow, and hard to keep the walls straight and square.
✕ Round drill bit
Leaves rounded corners you still have to clean up by hand.
✓ Avichome square chisel bits
Square holes with clean corners in one plunge.
What you can build
Furniture
Mortise-and-tenon joints for tables, chairs and benches.
Beds & frames
Strong, hidden joints without metal brackets.
Doors & gates
Square slots for rails, latches and hardware.
DIY & crafts
Square pegs, slots and decorative cut-outs.
For the cleanest results use a drill stand or drill press and clamp the workpiece.
Tech specs · what's in the box
Bit sizes
6.4 mm (1/4"), 8 mm (5/16"), 9.5 mm (3/8"), 12.7 mm (1/2")
Type
Hollow square chisel with spiral auger
Material
High-carbon steel
Total length
approx. 177–210 mm depending on size
Use with
Square Hole Mortise Drill Kit bracket, drill stand, drill press or mortiser
In the box
4 × square chisel bits with matching augers (drill bracket not included)
What Customers Say
4.8 / 5 · 18 reviews
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...
Amazing value, durable, and clean edges!
There is a little bit of a learning curve based on the wood that you are using. I had never used these type of bits before, but I quickly realized that in order to effectively drill mortise/tenon joints without having to spend a ton of...
Doing an excellent job.
I've been using thisform some heavier mortising work. It's not often that 1" is needed, but when it is, these have been doing an excellent job.
Customer Reviews
4.8
Based on 18 reviews
16 verified buyersModerated reviews
5★15
4★3
3★0
2★0
1★0
The right stuff
Does the job as expected
Good Value and performance
Works like it should
Worked well good value
Good shipping
Doing an excellent job.
I've been using thisform some heavier mortising work. It's not often that 1" is needed, but when it is, these have been doing an excellent job.
Durable item
I haven't put thus to the test just yet but I will tell you it's constructed very nicely. More to follow.
Drill bit
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.
Good product
Great heavy duty! Perfect gift
Amazing value, durable, and clean edges!
There is a little bit of a learning curve based on the wood that you are using. I had never used these type of bits before, but I quickly realized that in order to effectively drill mortise/tenon joints without having to spend a ton of time chiselling, I could just measure and drill small pilot holes spaced just inside the span of each bit. Huuuge time saver! They are sharp and ready to work. Well oiled for storage (for the couple of sizes I haven't used and likely won't often). Amazing value for the set compared to others selling singles!!
👌👌👌👌
Very good I will recommend to anyone
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 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.
Great product
Bought items for improvement of woodworking projects, they work as they should
Square hole drill adapter
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.
great quality
perfect as ordered good quality
Square Hole Drill Bit, Steel Hardness Sharp Mortising Chisel Set
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
As advertised & prompt delivery
Good quality, will buy again
great for making square holes
these are very good drill bits. cutting is very easy
Did the job
Works
Never run out of sharp bits
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