Self Tightening Drill Chuck 1/2in 2-13mm Clamping Range Quick Change Tool Feature: 1. Useful drill chuck: This chuck can fix various bits on the drill to better meet your different work needs, efficiently and effortlessly.2. Reliable Operation: Keyless and self-locking design ensures excellent stability at high speed operation, and the strong mount will not loosen.3. Wide to Fit: The drill chuck has a wide clamping range of 2-13mm, very suitable for a variety of bits, very practical and reliable.4. Superior Material: Adopting high-quality alloy material with solid structure, it is unlikely to break and is very durable for long-term use.5. Quick Installation: Quick change, keyless drill chuck with light weight and small size allows for convenient installation. Specification: Item type: drill chuck Chuck diameter: approx. 43mm/1.69 inch Connection size: 1/2-20UNF Clamping range: approx. 2 ~ 13mm / 0.08 ~ 0.51 inch Package List: 1 x Drill Chuck 3 x Rod How to use: Screw on the drill bit.