Makita Keyless Chucks are engineered for heavy duty applications. The Quick Change ½” Keyless Drill Chuck is constructed of high-quality steel for added durability and long service life. The Chuck installs quickly and easily to convert an SDS-Plus Rotary Hammer into a driver drill. It is designed to accept up to ½” round and hex shank bits. The Quick Change Keyless Chuck is for use with Makita 18V X2 LXT Cordless 1-1/8” AVT Rotary Hammer (XRH11Z, sold separately).