Geared chuck: 1.5 - 13mm; 1/2" - 20 UNF; SDS-plus adapter with 1/2" - 20 UNF male thread, chuck key, For use on rotary hammers with SDS plus holder, For clamping of straight shank drills, tools with straight shaft, Suitable for drilling without hammer impact, Drills through using locking screw for clockwise and anti-clockwise operating machines