Quick-Release Chuck + SDS-Plus Adapter + Wrench. Material: Durable, high-quality professional tool steel Chuck with 1/2/20 UNF internal thread. Clamping capacity: 1.5 - 13 mm Conveniently tighten with one hand thanks to the exclusive single-sleeve design. The unique torque stop is easy to operate and apply, resulting in superior clamping. Quick-change SDS shank for power hammers allows you to instantly convert the impact driver to a non-quick-change drill bit holder. With SDS-Plus Adapter With Wrench 1/2/20 UNF internal thread. Clamping capacity: 1.5 - 13 mm Robust, professional tool steel chuck