Reaper cutting tools just came out with a superior set of Vari-Bits. Instead of the industry, cone style, straight flute standard of your regular step bits, these brand new step bits have a 135-degree split tip and quad spiral flutes built-in for super-aggressive cutting in all your heavy metals, woods, plastics, etc. The Quick Connect shanks are specially machined for Non-Slip performance, especially in cordless drill keyless chucks in sizes #1 thru #3; the #4 & #5 are 3/8" Shanks with 3 flats for better chuck grab. Like all Reaper products, our step drills are constructed from a sophisticated German alloy of tungsten, cobalt, and M7 steel. They range in size from 1/8” all the way up to 1-3/8”. All sizes are laser-stamped on each piece for easy identification.