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Features: 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 double effect by matched use with mortise and tenon machine, the square hole punching needs to use electric drill, hammer & other tools.Specifications: Material: HSS Hardness: HRC 48~50 Holder diameter: 19mm (circular) Drilling core length: 200mm Slotting flute diameter: 1/2"(12.7mm) Total weight: approx 206g Package Included: 1x Tenon Hole Drill Bit