Hitecera 5-Piece 10197A Metric Step Drill Set HSS Cobalt Multiple Hole 50 Sizes 1/4-Inch and 3/8-Inch Shanks, SAE, w/Aluminum Case VERSATILE: Set includes five standard SAE step drill bits with a two-flute design for faster, smoother cutting and a tri-flat shank for a sure grip A COMPLETE SAE SET: Two popular 1/4" and 3/8" shank sizes to cover a wide range of drilling requirements CUTS AND DEBURRS: Cuts through steel, sheet metal and other surfaces with only a small amount of pressure and deburrs as you drill SUPER STRONG: Made of super strong HSS steel for added durability and bit life CARRYING CASE: Includes aluminum carrying case