ITEM NAME:0.3-6.5mm keyless chuck quick change adapter brick rotary tools drill bit JR.Convert 1/4 "Hex Shank Screwdriver into a Drill. 1/4 "Keyless Chuck 6.35mm. Use This Chuck to Convert Any cordless Screwdriver into a drill or grinder. 1 1/4 "Hex Shank Drill. Drill Chuck Dia: 0.3-6.5mm.