Heavy Duty steel SDS drill adaptor to convert SDS drilling machines to accept standard straight shank drill bits eg: HSS jobber drills, Auger Drills., Masonry drills etc. Fits into any keyed or keyless chuck with a 1/2' x 20 UNF Thread. SDS fitting. 1/2" x 20 UNF thread. Complete with screw for reversing drill chucks.