Square Hole Drill Bits - 1/4" - 1/2"

For Mortise and Tenon Work and any time you need precise square or rectrangular holes.

Works better with a drill press - and please use caution during set-ups.

1/4 "(6.35mm), 5/16"(7.94mm), 3/8 "(9.5mm), 1/2"(12.7mm).
This size refers to the side length of the square hole made by square hole drill.
The cylindrical diameter of the clamping part is 19mm.
Square hole drill diamond filter are above 210mm