Replacement drill chuck: A 1/2 - 20UNF, 2-13mm self - tighten keyless drill chuck made of high - quality alloy steel. It has strong clamping force, good wear resistance and stable performance. Self - tightening Ratchet Design: No chuck key needed. Ratchet sound prompts when tightening or loosening. Easy to operate and boosts work efficiency. Wide Compatibility: With 1/2 - 20UNF thread and 2-13mm clamping range, it fits most electric drills like for Milwaukee, for Dewalt, etc. Adaptable Shank Compatibility: Comes with a 3/8Inch to 1/2Inch adapter for seamless use with 3/8Inch SDS - Plus and 1/4Inch hex shanks. Convenient and practical: Easily convert your rotary hammer/impact wrench/impact Screwdriver into a drill rather than spending money having multiple. Color:As Shown Material:Metal Package Contents: 1 * drill chuck adapter set 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 picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.