Function: 1. With 3 connecting rods: the handle can clamp the drill firmly and is not easy to loosen. Equipped with 3 types of connecting rods at the same time, you can use without worrying too much 2. HIGH FRICTION WITHOUT SLIPPING: all metal housing with knurled design, has high friction, not easy to slip, high strength, durability, long service life, suitable for long-term operation 3. You do not need complicated programs to operate 4. FIXTURE FROM 2 TO 13 MM: The size of the fixture is large from 2 to 13 mm, suitable for various drills. Can meet your different needs 5. Stable without loosening: self-clamping design is more ergonomic. The built-in self-locking handle is more stable, and the fixed bit and drill bit do not slip or loosen, which is very convenient to operate Specification: Item Type: Self-Clamping Drill Chuck Material: Iron Handle diameter: approx. mm / 1.69 inch Handle length: approx. mm / 2.28in Connection Size: 1/2-20UNF Mounting range: approx. 2 mm /0.080.51in List of packages: 1 x Self-Clamping Drill Chuck 3 x connecting rod