High Quality and New Heavy duty design, special quenching treated key parts increases durability, strong impact resistance. For use 1 or 2-inch impact wrench, 3 or 8-inch chuck allows you to lock and release bits to help keep you on task on the job. Classic keyed 3-jaw design securely holds a wide range of twist drills and step drill bits with 1 or 16-inch-3 or 8-inch shank 1 or 2-inch Square female socket adapter can easily transform power impact wrench to a drill. Name:Drill Chuck Set Shank Type: 1 or 2-inch Square Female Socket Adapter Mount: 3 or 8-24UNF Please Note: The chuck can NOT be used counterclockwise! colour:Black Material:metal size:1.5-10mm Package Contents: 1 x Drill Chuck 1 x 1 or 2-inch Square Female Socket Adapter 1 x Wrench Only the above package content, other products are not included. Note: Light 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.