Upgrade Square Hole Drill Bit Steel Hardness for Durable Mortising Chisel
Features: Professional drill bit, suitable for installation, renovation, decoration industry, etc.
The utility model in the hole drilled by the rotary body, while the impact of the use of hammer impact force transmitted to the outer, body the material crushing round hole and square headwall, one-time processing of a square hole, and the dust can be broken slag discharged from the tube.
high-speed steel. Heat HRC48~50, high hardness, lengthened core, high concentricity.
Great for drilling square holes in with a mortising machine or a mortising attachment. Fits all mortising machines and drill press attachments.
It will get a double effect by use with mortise and tenon machine. The square hole punching needs to use electric drills, hammer & other tools.