PREMIUM MATERIALS - Auger drill bits are made of high carbon steel, hardened and tempered for longer life. Unique Design - Four flutes design for faster chip evacuation, full helical tip, making the drill self-feeding for easier drilling. Improve work efficiency Suitable for machine - suitable for pistol drills, bench drills, vertical drills, portable electric drills, vertical electric drills, mobile magnetic drills, etc. Versatility - For cutting wood products, installing ball door bits, drawers, plastics, wood, plywood and more. 14mm, 16mm, 18mm, 11/14 (20mm), 13/15 (22mm), 63/64 (25mm) to meet your different needs Color: Black Note: Due to the difference in light and screen settings, the actual color may be slightly different from the picture. There are different. . Please allow minor size differences due to manual measurement differences.