Naittoop Clearance 4 Pcs Hole Saw Mortise Drill Bit Set Mortising Woodworking Tool

4 Pcs Hole Saw Mortise Drill Bit Set Mortising Woodworking Tool Features: hole drill can not be used on an electric drill drill holes need to fit a hole drill drilling (mortise and machine) to use. and easy to use. wood drill bit suitable for construction installation decoration industry etc. Special steel heat HRC48~50 high hardness lengthened core high concentricity. Reduce labor of construction workers speed up the construction speed reduce construction costs for construction installation decoration industries. Specifications: Material: Hardness: HRC 48~50 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 Package Included: 4pcs Hole Drill Bit