Features The SDS adapter allows this drill chuck to mount on electric hammer so as to convert electric hammer into a power drill. By using specialized anti-thrust bearing to convert key-applied into superior gripping,Easy to use, Suitable for novice or professional use. The clamping jaws are specially treated to improve wear resistance,All metal construction for long durability,high strength, high cost performance. Classic keyed 3-jaw design securely holds a wide range of twist drills conveniently. 1.5-1m drill chuck clamping range, 1/2-20UNF mounting threads at the back of the chuck. Specification: Material: Steel Clamping Range: 1.5-1m Mounting thread: 1/2-20UNF   Package list: 1 x Drill Chuck 1 x Key 1 x SDS Square Shank Adapter Package List