20 Piece, Black Oxide, Metal Drilling, Bit Set, Black Oxide Finish For Greater Wear Protection & Longevity Of The Bit, Parabolic Flute Design Gives These Bits Greater Strength, 135 Degree Split Point Design That Reduces Slip & Walking & Allows For Easier No-Slip Starting, Sturdy Tough Case Container To Keep Bits Organized, Tough Cases Have A Sliding Soft Grip Lock That Keeps The Case Closed Securely To Prevent Lost Bits, Ideal For Drilling In Metal, Wood & Plastics, Includes: (3) 1/16", (1) 5/64", (2 ) 3/32", (1) 7/64", (2) 1/8", (1) 9/64", (1) 5/32", (1) 11/64", (1)3/16", (1) 13/64", (1) 7/32", (1) 15/64", (1) 1/4", (1) 5/16", (1) 3/8" & (1) 1/2".