Features With 3 Connecting Rods: The keyless hand drill chuck can clamp the drill firmly and is not easy to loosen. Equipped with 3 kinds of connecting rods at the same time, you can use without worrying too much. High Friction without Slip: The hand drill chuck has all metal shell with knurled design, possess high friction, not easy to slip, high strength, durable, long service life, suitable for long term work. Easy Installation: The keyless self-tighten type drill chuck is easy to install and remove, more convenient and labor saving. You don't need complicated programs to use. 2 to 13mm Fixture: The size of the fixture is large from 2 to 13mm, suitable for a variety of drills. Can meet your various needs. Stable without Loosen: Self tightening design is more ergonomic. The built in self locking chuck is more stable, and the fixed bit and drill will not slip or loosen, which is very convenient for you to operate Specification: Item Type: Self Tighten Drill Chuck Material: Iron Chuck Diameter: Approx. 43mm / 1.69in Chuck Length: Approx. 58mm / 2.28in Connection Size: 1/2-20UNF Clamping Range: Approx. 2 ~ 13mm / 0.08 ~ 0.51in Package List: 1 x Self Tighten Drill Chuck 3 x Connecting Rod Package List 1 x Self Tighten Drill Chuck 3 x Connecting Rod