DRILL ALL STEEL CHUCK & SDS Adaptor 10MM 3/8x24 UNF. 3/8" x 24 UNF Female Mount + 3/8 SDS Adaptor. with a hole in the rear for counterclockwise screw to lock it in the SDS adaptor shaft. hardened steel, anti-thrust bearing,3 heat-treated jaws,solid steel precision & durable keyed drill chuck.
eBay