Feature: 1. Easy to use: Immediately convert the impact drill bit and quickly replace the drill bit 2. Easy to replace: The of keyless chuck are tightened to facilitate the replacement of drill bit 3. Design: Three-stage design, allowing you to hold 1.5mm-13mm round drill bits 4. Function: Greater clamping force, which can effectively prevent the drill from loosening and is more 5. Application: Quick replacement of SDS Plus/Hex/Square internal thread adapter with electric hammer Specification: Model Number: Drill Chuck Clamping rate: 1.5-13mm Thread specification: 1/2-20UNF Chuck size: about 71 x 43mm / 2.8 x 1.69 in : Metal colour: as shown Package Contents: 4 x Metal Chuck Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.