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 the double effect by matched use with mortise and tenon machine.
Drill lengthened, high concentricity.
The whole heat treatment, HRC48-50, high hardness.
With the use of tenon machine, if the manual open hole, you need a hand drill and hammer and other tools.