- 1. This square hole drill bits made of bearing steel, hardness 56HRC, lengthened core, sharp cutting edge, continuous blade, quick cuttings, high efficiency. Note: If for drill press to use, must have a mortising attachment (Not Included).
- 2. Wood drill bit suitable for construction, installation, renovation, decoration industry, etc.(Requires an Adapter）
- 3. Mortise drill bit set made of special steel, heat treatment, HRC48~50, high hardness, lengthened core, high concentricity.
- 4. This square wood drill chisel will get double effect by matched use with mortise and tenon machine.
- 5. The square hole punching needs to use electric drill, hammer & other tools.
