These Square Hole Drill Bits are made of bearing steel, hardness 56HRC, lengthened core, sharp cutting edge, continuous blade, quick cuttings, high efficiency. Our woodworking mortising chisel bits set only use for the opening square hole and keyhole drill. This Saw Drill Bit is made of special steel, heat treatment, HRC48-50, offers high hardness, lengthened core, and high concentricity. Mortise & Tenon Square Hole Drilled by Safer CCTV + outer sleeve in the middle of the combination reduces construction workers' labour intensity, speeds up the construction speed, and reduces construction costs for construction, installation, and renovation decoration industry. Using different specifications of the Square Hole Drill, matching the appropriate power of the square hole machine, you can play a square hole to meet the requirements - 1/2-Inch(12.7mm), 1/4-Inch(6mm), 3/4inch(19mm), 3/8-Inch(9.5mm), 5/8-Inch(16mm), 5/16-Inch(8mm), 9/16-Inch(14mm). KEY FEATURES: This saw drill bit is made of special steel, heat treatment, HRC48-50, Offers high hardness, lengthened core, and high concentricity. Durable & Professional drill bit, Suitable for construction, installation, renovation, decoration industry, etc. It will get double effect by matched use with mortise and tenon machine 6 pieces a pack with different slot diameters to meet your needs. Great accessory for mortising, chisel, and woodworking PRODUCT DETAILS:Material: High-speed SteelHardness: HRC48-50Drilling Core Length: 200mmSize: 6.4mm/ 8mm/ 9.5mm/ 12.7mm/ 14mm/16mm/Full Set PACKAGE OPTIONS INCLUDES:1x Square Wood Chisel (Full Set)1x Per size (6.4mm/ 8mm/ 9.5mm/ 12.7mm/ 14mm/16mm/Full Set)
