Square Hole Drill Bit Sets, 5Pcs Woodworking Square Drill Bits Set, HSS Wood Mortising Chisel Countersink Bits DIY Hole Opening Drilling Tools, 6.4mm/8mm/9.5mm/11mm/12.7mm

• Five Size: 1/4 Inch (6.0mm), 5/16 Inch (8mm), 3/8 Inch (9.5mm), 7/16 Inch (11mm), 1/2 Inch (12.7mm), 5 kinds of sizes can meet your different ordinary need.
• High Quality: These square hole drill bits made of high speed steel, through heat processing, with high hardness drill bits, and sharp-edged square chisel, long life.
• Easy to Use: It will get double effect by matched use with mortise and tenon machine.The square hole punching needs to use electric drill, hammer or other tools.
• Fit Machine: Great for drilling square holes in wood with a mortising machine or a mortising attachment. Fits all mortising machines and drill press attachments. Square hole drill is mainly used for woodworking aspects.
• Save time: These woodworking morstising chisel bits can reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industrie

Specification: Material: high-speed steel Special steel, heat treatment, HRC48~50, high hardness, lengthened core, high concentricity. Hardness: HRC48-50 Size: 1/4 Inch (6.0mm), 5/16 Inch (8mm), 3/8 Inch (9.5mm), 7/16 Inch (11mm), 1/2 Inch (12.7mm) Clamping shank diameter: 19mm (Round) Slotting flute diameter Total weight 1/4"(6.35mm) approx 115g 5/16"(8mm) approx 140g 3/8"(9.5mm) approx 165g 7/16"(11mm) approx 190g 1/2"(12.7mm) approx 220g Shaft length ( Drilling depth ): 1/4"(6.35mm): 50mm 5/16"(8mm): 50mm 3/8"(9.5mm): 55mm 7/16"(11mm): 60mm 1/2"(12.7mm): 75mm