Features: Instantly convert impact driver to hold non-quick change drill & driver bits. Keyless chuck finger-tightens for easy-bit changes. Class 3-Jaw Design - Allows you to effortlessly hold round-shank drill bits from 1.5mm to 13mm securely. Greater clamping force, effectively preventing drill bits loose off, more reliable. Quick-change SDS-Plus/Hex/Square female adapter for electric-hammer. Specifications: Material:Alloy Size:Approx.4.3x7.1cm/1.69x2.79inch Color:Black Mount:1/2-20UNF Package Includes: 2x Drill Chuck note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.