Number Of Hole Sizes: 6Shank: 1/4"Patented Two Flute Design Cuts Fast, Clean, Accurate And Burr-Free Round Holes135° Split Point Design For Faster On Contact Penetration And Less WalkingGood For Material Up To 1/8"Works On Plastic, Wood And Most Metals Including Steel, Brass, Aluminum, Copper And Stainless SteelSizes: 3/16", 1/4", 5/16", 3/8", 7/16", 1/2"