GOLD STEPPED POINT COBALT: Drill America GSC Series Gold Stepped Point Cobalt Drill Bits start easier, drill faster, increase lifespan, and reduce heat compared to standard drill bits BEST USES: This 29pc set comes with storage holder case and can be used as an enlarger for existing holes or to create new, smoother holes for multi material drilling in acrylic, steel, brass and other hardened metals 135 DEGREE CUTTING ANGLE: These drill bits have a 135 degree split point tip and 3 -flat shank to prevent spinning; Sizes 11/64" and smaller have a round shank; Drill Bits have a gold oxide finish and jobber length INCH SIZES INCLUDED: 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64, 1/4, 17/64, 9/32, 19/64, 5/16, 21/64, 11/32, 23/64, 3/8, 25/64, 13/32, 27/64, 7/16, 29/64, 15/32, 31/64 and 1/2 ABOUT DRILL AMERICA: Drill America specializes in supplying a full line of industrial and contractor cutting tools since 1923; Our products include drills, taps and dies, reamers, end mills, carbide burs, countersinks and more