Titanium HSS Step Drill Bits Set with 1/4-Inch and 3/8-Inch Shanks By HILLO, SAE, 5-Piece with Aluminum Protective Case VERSATILE AND FAST: 3/8" 3-flat shank prevents slippage when drilling new holes or enlarging existing holes CUTS AND DEBURRS: Cuts through steel, sheet metal and other surfaces with only a small amount of pressure and deburrs as you drill TITANIUM COATED STRENGTH: Made of super strong M2 steel with titanium coating for added durability and bit life 2-FLUTE DESIGN: Titanium-coated bit with 2-flute design for versatile drilling in steel, stainless steel, copper, aluminum, and other surfaces CARRYING CASE: Includes aluminum carrying case