Jacobs 31051 1/2" SoftGrip Single Sleeve Keyless Drill Chuck For 1/2" Drills with a spindle lock 1/16" - 1/2" capacity 1/2-20 (13mm) Mount Fits 1/2" Dewalt, Black & Decker, Milwaukee, Makita, Skil, Bosch, Craftsman and most major brands