ITEM NAME:1.5-10mm Drill chuck driver converter 3/8''24UNF quick connect with key adapt Bj.Mount: 3/8" - 24UNF. Conveniently tighten with classic keyed 3-jaw design. Chuck capacity range: 1.5mm - 10mm(1/16" - 3/8"). Easily change from fastening to drilling with 1/4" hex quick connect. Turns any cordless power screwdriver into a drill or grinder to quickly switch tasks and keep the job moving.