Atoplee 1pcs Woodworker 1/2 Inch Square Hole Drill Bits Mortising Chisel Set, Mortise Chisel & Bit Set

Square hole drill using method:

1.installed in the square hole machine directly , supporting the use, you can drill a square hole (especially recommended).

2. If bench drills or electric drills are used, they must be strictly executed according to the operation method.

Otherwise, they can only be processed into round holes and cannot be processed into square holes.

First, mark the position of the hole and use the hole drill to make a hole.

Secondly, after removing the core, use a square hole jacket to align the position of the hole.

Finally, tap the square hole continuously and slowly.

Then,you can get the square hole.

Features:

Professional wood drill bit, suitable for construction, installation, renovation, decoration industry, etc.

Special steel, heat treatment, HRC48~50, high hardness, lengthened core, high concentricity.

It will get double effect by matched use with mortise and tenon machine, the square hole punching needs to use electric drill, hammer & other tools.