Perfect Square Hole Drill Bit

The Square Hole Drill Bit creates perfect squares every time effortlessly! You'll definitely need this for your next project! Product Features:   1. 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. Mortise and tenon square hole drilled by the terrible + outer sleeve in the middle of the combination.3. Reduce labor intensity of construction workers, speed up the construction speed, reduce construction costs for construction, installation, renovation, decoration industries.4. Use matters: Square hole drill is mainly used for woodworking aspects.    Product Specifications:  1. Material: high-speed steel,2. Hardness: 56HRC3. Clamping shank diameter:19 mm / 0.75 in (Round)      10 mm / 0.39 in diameter slotted (front square)      Middle terrible diameter--total length: 19.5 cm / 7.68 in ,diameter: 6.8 mm / 0.27 inPackage Included:   1 *woodworking square hole drill