Step Point drill bits combine a split tip point with a step drill design for accurate starting without the need of a center punch. This distinctive design reduces heat to increase the tool life of the drill bit and can be used to enlarge existing holes without damaging the drill bit point. 3-Flats on the shanks, sizes 3/16" and above, to help eliminate slippage in your chuck. Great for hard steel, brass, sheet metal and acrylics. Drill bit sizes: 9/16", 5/8", 3/4", 1"