6 Pcs Square Hole Saw Mortise Drill Bit Set Mortising Chisel Woodworking Tool

6 Pcs Square Hole Saw Mortise Drill Bit Set Mortising Chisel Woodworking Tool Features: Square hole drill can not be used on an electric drill drill square holes need to fit a square hole drill drilling (mortise and tenon machine) to use. Durable and easy to use. Professional wood drill bit suitable for construction installation renovation decoration industry etc. Special steel heat treatment HRC48~50 high hardness lengthened core high concentricity. Reduce labor intensity of construction workers speed up the construction speed reduce construction costs for construction installation renovation decoration industries. Specifications: Material: HSS Hardness: HRC 48~50 Holder diameter: 19mm (circular) Drilling core length: 200mm Slotting flute diameter Total weight 001 1/4 (6.35mm) approx 150g 002 5/16 (8mm) approx 161g 003 3/8 (9.5mm) approx 177g 004 1/2 (12.7mm) approx 206g 005 9/16 (14mm) approx 251g 006 5/8 (16mm) approx 310g Package Included: 6pcs Tenon Hole Drill Bit