Used for wood perforation, spherical tip installation door, drawer tip, plastic products, wood, plywood, etc, Trepanning smoother, less noise. Sharp edge, high hardness, precise positioning, high precision, cut, impact strength, high toughness. Enable woodworkers to drill holes without having to drill through the material when a clean and precise down on a hole. of high-quality alloy blade, blade make more sharp and durable, it is head to take bow curved, advantageous for chip removal, perforation is more efficient. Suitable for handheld drill, stand motor drill and mobile band type magnetism drill. Color: Gray Material: HSS Diameter: 40mm length: 80 mm Shaft length: 65mm Shaft diameter: 7 mm-10 mm Head length: 15 mm Hardened and tempered, carbon steel construction. Package Include: 1 X Art drills Pipe drills Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.