Features: 1. Comfortable surface of sleeve and positive gripping can apply more output moment of force. 2. By using specialized anti-thrust bearing to convert hand-applied moment of force into superior gripping force. 3. Aesthetic and practical design of surface make sure the front and rear sleeve cooperate with each other more effective and reduce the run out of sleeve. 4. Unique structure, can very good clamp bit head. 5. The clamping range of chuck is 0.8-10mm. Specification: Condition: 100% Brand New Item Type: Drill Chuck Material: Plastic Clamping Range: 0.8-10 mm Connection Thread: 3/8-24UNF Package List: 1 * Drill Chuck 0.8-10mm 3/8-24UNF 1 * 1/4 Hex Head 3/8 Thread Extension Rod Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.