Includes 1 YEAR MANUFACTURES WARRANTY! 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 Total weight 001 1/4in(6.35mm) approx 150g 002 5/16in(8mm) approx 161g 003 3/8in(9.5mm) approx 177g 004 1/2in(12.7mm) approx 206g 005 9/16in(14mm) approx 251g 006 5/8in(16mm) approx 310g Shaft length: 1/4in(6.35mm): 60mm 5/16in(8mm): 60mm 3/8in(9.5mm): 75mm 1/2in(12.7mm): 60mm 9/16in(14mm): 70mm 5/8in(16mm): 70mm Package Included: 6x Tenon Hole Drill Bit.
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