Feature:1. WITH 3 CONNECTING RODS: The 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 much2. HIGH FRICTION WITHOUT SLIP: All metal shell with knurled design, possess high friction, not easy to slip, high strength, durable, long service life, suitable for long term work3. EASY INSTALLATION: Easy to install and remove, more convenient and labor saving. You don't need complicated programs to use4. 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 needs5. 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 operateSpecification:Item Type: Self Tighten Drill ChuckMaterial: IronChuck Diameter: Approx. 43mm / 1.69inChuck Length: Approx. 58mm / 2.28inConnection Size: 1/2-20UNFClamping Range: Approx. 2 ~ 13mm / 0.08 ~ 0.51inPackage List:1 x Self Tighten Drill Chuck3 x Connecting Rod