WD Music HMRBL Humbucker Ring Low Flat - Black Will match the standard U.S. / Gibson mounting screw pattern without modification Typically used in a neck position humbucker application where a flat angled bottom is needed plastic humbucker mounting ring This is a short plastic humbucker ring with an arched bottom, designed for usage on arched or carved top guitars It has slightly larger exterior dimensions and mounting hole locations. Plastic humbucker mounting ring Will match the standard U.S. / Gibson mounting screw pattern without modification