Unxuey 5pcs 1/4", 5/16", 3/8", 7/16", 1/2" Woodworking Square Hole Drill Bits Mortising Chisel Set Wood Square Hole Saw Sets Chisel Cutter with Twist Drill Opening Drilling Tools

• Material: High-speed steel / HSS, heat treatment, HRC48~50, high hardness, lengthened core, high concentricity
• Size: 1/4 Inch (6.35mm), 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
• 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
• This set of great woodworker tools can reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs
• Professional drill bit, suitable for construction, installation, renovation, decoration industry, etc

* Note: * 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. * To avoid drill bits become overheated and get burned up due to fast rotary friction, we suggest use cutting fluid to keep the bits cold during usage. * Professional wood drill bit, suitable for construction, installation, renovation, decoration industry, etc. * The utility model in the hole drilled by the rotary body, while the impact of the use of hammer impact force transmitted to the outer, body the material crushing round hole and square head wall, a one-time processing of a square hole, and the dust can be broken slag discharged from the tube. * Material: high-speed steel * Special steel, heat treatment, HRC48~50, high hardness, lengthened core, high concentricity. * Hardness: HRC48-50 * Size: 1/4 Inch (6.35mm), 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 * Package include: 5pcs Square Hole Drill Bit