Features The keyless self-tightening design is more ergonomic. The collet can fix the drill bit tightly, strong and not easy to loosen. Durable, long service life, suitable for long hours of work. Easy installation and disassembly, more convenient and labor-saving. The size of the fixture is large, from 2 to 1m, suitable for a variety of drills. Features: -The keyless self-tightening design is more ergonomic. -The collet can fix the drill bit tightly, strong and not easy to loosen. -Durable, long service life, suitable for long hours of work. -Easy installation and disassembly, more convenient and labor-saving. -The size of the fixture is large, from 2 to 1m, suitable for a variety of drills. Specification: Diameter:4m/1.69in Length:58mm/2.28in Connection Size:1/2-20UNF Clamp Range:2 ~ 1m / 0.04 ~ 0.51in Package List: 1 x Drill Chuck Package List