Champion XG12 black gold S&D drills are ideal for drilling large diameter holes in steel, stainless steel and other tough alloys using a drill press or portable electric drill. They feature 1/2 In. flatted shanks for use in a 1/2 In. electric drill chuck. Black gold drills have superior strength and durability to standard S&D drills. The black gold surface treatment holds lubricant better for smoother drilling and added heat resistance. Self centering 118 degree point prevents the drill from walking.