Features Self Locking: The electric drill chuck is self locking, can be used directly after replacing on the electric drill and tightened. Stable Connection: The precise drill chuck body ensures a tight and stable connection, the fine and strict processing guarantees its long service life. ABS and High Carbon Steel: The multi quick replacement keyless chuck is made of high quality ABS and high carbon steel, which is wear resistant and durable. With Adapter: This self tighten drill chuck provides adapter to securely attach a drill chuck and impact wrench, converting the impact driver to drill bit. Standard Thread: The connecting thread is 1/2in 20UNF with standard size, the drill chuck has wide clamping range, which is 2‑13mm. Specification: Item Type: Self Tighten Drill Chuck Material: ABS, high carbon steel Clamping Range: 2-13mm Drill Chuck Connection Thread: 1/2in 20UNF Used for: Impact wrench Package List: 1 x Self Tighten Drill Chuck 2 x Conversion Adapter 1 x O Ring 1 x Dowel Pin Package List 1 x Self Tighten Drill Chuck 2 x Conversion Adapter 1 x O Ring 1 x Dowel Pin