1. Fits all mortising machines and drill press attachments.
2. One-time drilling a square hole, and the broken slag dust can be discharged from the tube.
3. Made of high-speed steel, heat treatment, high hardness, lengthened core, high concentricity.
4. 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.
5. Packed Included: 1pcs wood drill bit 9/16 Inch.