Feature:1. Self Locking: The electric drill chuck is self locking, can be used directly after replacing on the electric drill and tightened2. Stable Connection: The precise drill chuck body ensures a tight and stable connection, the fine and strict processing guarantees its long service life3. ABS and High Carbon Steel: The drill chuck is made of high quality ABS and high carbon steel, which is wear resistant and durable4. With Adapter: This drill chuck provides adapter to securely attach a drill chuck and impact wrench, converting the impact driver to drill bit5. Standard Thread: The connecting thread is 1/2in 20UNF with standard size, the drill chuck has wide clamping range, which is 213mmSpecification:Item Type: Self Tighten Drill ChuckMaterial: ABS, high carbon steelClamping Range: 2-13mmDrill Chuck Connection Thread: 1/2in 20UNFUsed for: Impact wrench.Package List:1 xSelf Tighten Drill Chuck2 x Conversion Adapter1 x O Ring1 x Dowel Pin