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● The professional wood drill bit, suitable for construction, installation, renovation, decoration industry, etc. ● Wood material crushing round hole drill and square headwall set, a one-time processing of a square hole, and the broken slag dust can be discharged from the tube. Specifications: Material: HSS Hardness: HRC 48~50 Holder diameter: 19mm (circular) Drilling core length: 215mm Slotting flute diameter: 1/4, 5/16, 3/8,1/2 inch Weight: 200g each Note: Square hole drill bit cannot be used on a hand drill, it needs to fit a square hole drill drilling (mortise and tenon machine) to use. Package Includes: 4 x Square Hole Drill Bit(1/4, 5/16, 3/8,1/2)