Specifications: Hardened and tempered, carbon steel construction. Trepanning more smoothless noise. Used for wood perforation, spherical door tip installation, drawer tip, plastic products, wood, plywood. Sharped edge, high hardness, accurate positioning, high precision, smooth cutting, high toughness. Enable woodworkers to drill holes without passing through the material when a clean and precise bottom to a hole. Selection of high quality alloy blade, make blade more sharped and durable, it's head adopt arc curve design, beneficial to chip removal, perforation is more efficient. Suitable for hand held electric drill, stand motor-driven drilling machine and mobile ribbon type magnetism drilling machine. Type: Drill Bit Main Color: Sliver Material: Hard Alloy Size: 16 mm, 18 mm, 19 mm, 20 mm, 22 mm, 25 mm, 28 mm, 30 mm, 32 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Drill Bit