Hollow Square Hole Saw, Drill, Drill, Woodworking Tool, High Carbon Steel feature Square hole drills cannot be used for electric drills, and square hole drills need to be suitable for square hole drills (mortise mortise machines). The mortise and mortise bore holes in the terrible outer sleeve in the middle of the assembly. Reduce the labor intensity of construction workers, speed up construction, and reduce construction costs in construction, installation, decoration, and decoration industries. specification: Material: bearing steel Hardness: 56HRC Diameter of clamping handle: 19mm (round) Model: Slotted diameter 8 or 9.5 or 11 or 12.7 or 14 or 16 or 19 or 22 or 25 mm (front square) Use matters: Square hole drills are mainly used in woodworking. Existing various drills can only process a round hole, not a square hole. To process a square hole, you must drill the hole or use a cutting machine to rough it. Hole, and then chiseled with artificial hands. The utility model drills holes on the rotating body, and at the same time uses the impact force of the hammer to transmit the impact force to the outside On the body, the material is crushed into round holes and square head walls, one square hole is processed at a time, and the slag after can be broken out of the tube. use Square hole drills of different specifications can be matched with square hole machines of corresponding power to produce square holes that meet the requirements. note: Due to manual measurement, please allow a difference of 1-3mm. Due to different displays and different lighting, the picture may not reflect the actual color of the item. Thank you for your understanding. Package Contents: 1 x woodworking square hole drill