23 Piece, Titanium, Shockwave Drill Bit Kit Includes: (2) 1/16", (2) 5/64", (1) 3/32", (2) 7/64", (2) 1/8", (1) 9/64", (2) 5/32", (1) 11/64", (2) 3/16", (1) 13/64", (1) 7/32", (2) 1/4", (1) 5/16", (1) 3/8", (1) 1/2", Red Helix Are Engineered For Impacts & Drills, Variable Helix With An Aggressive 35 Degree Helix Angle Which Ends At 15 Degree, Rapid Chip Removal To Limit Heat Buildup To Stay Sharper Longer, 135 Degree Split Point Tip Delivers A Precision Start & Prevents Walking For Fast, Accurate Holes, Titanium Coating Can Be Used In All Drilling Applications To Give You Up To 3X Life Than Black Oxide Drill Bits.