The chuck can hold the drill bit firmly and sturdy, not easy to loosen. Durable and has a long service life, suitable for long-time work. Easy to install and disassemble, more convenient and more economical. Wide range of collet sizes from 2 to 13 mm, suitable for many types of drill bits. The Keyless and self-tightening type design is more in line with human engineering. Features: The chuck can hold the drill bit firmly and sturdy, not easy to loosen. Durable and has a long service life, suitable for long-time work. Easy to install and disassemble, more convenient and more labor-saving. Wide range of collet sizes from 2 to 13 mm, suitable for many types of drill bits. The keyless and self-tightening type design is more in line with human engineering. Specification: < p>Diameter: 43 mm/1.69 in Length: 58mm/2.28in Connection size: 1/2-20UNF Clamping range: 2~13mm/0.04~0.51in Package List: 1 x Drill Chuck< /p>