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 (6.0mm), 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 * Package include: 5pcs Square Hole Drill Bit

Drills precise holes with little pressure -- 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(6.4mm), 3/8-Inch(9.5mm) , 5/16-Inch(7.94mm) 7/16 Inch (11mm). 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. 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. Widely Used - Great for drilling square holes in wood with a mortising machine or a mortising attachment. 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.

Surface Recommendation: Wood,Steel. Tool Flute Type: Straight. Brand: SYWAN. Shank Type: Square. Material: Alloy Steel. Best Sellers Rank: See Top 100 in Tools & Home Improvement. : B08Z85P3VY. Manufacturer: Big waves. Date First Available: November 16, 2020. Item model number: 265. Package Dimensions: 8.7 x 4.84 x 1.14 inches; 1.7 Pounds.