Hitecera 10193A 3PC Titanium Nitride Coated M2 High Speed Steel Step Drill Bit Set 28 Sizes,Quick-change 1/4" Hex Shank SAE | 3-Piece Set REPLACES 28 DRILL BITS: This set includes three standard SAE step drill bits that replace 28 individual drill bits TITANIUM COATED STRENGTH: Made of super strong M2 steel with titanium coating for added durability and bit life SMOOTH DRILLING ACTION: Two-flute design provides faster, smoother cutting without walking and a tri-flat shank ensure a firm grip A COMPLETE SAE SET: Comes with one 3/16-inch to 1/2-inch six-step bit, 1/4-inch to 3/4-inch nine-step bit, and 1/8-inch to 1/2-inch 13-step bit CUTS AND DEBURRS: Cuts through steel, sheet metal and other surfaces with only a small amount of pressure and deburrs as you drill