Irwin 15502 Step Drill Bit Set 17 Hole Sizes, 1/4 in to 3/4 in/1/8 in to 1/2 in/3/16 in to 1/2 in

Step Drill Bit Set, High Speed Steel, TiN, 1/4 in to 3/4 in, 1/8 in to 1/2 in, 3/16 in to 1/2 in Size Range, Straight with Three Flats, Number of Drill Bits 3, Shank Hex Size 1/4 in Number of Pieces 3 Cutting Direction Right Hand Drill Bit Material High Speed Steel Includes 15101 (1/8 in to 1/2 in), 15102 (3/16 in to 1/2 in), 15103 (1/4 in to 3/4 in) Shank Shape Three-Flat Number of Flutes 1 Shank Type Hex Decimal Equivalent 0.125, 0.1563, 0.1875, 0.2188, 0.25, 0.2813, 0.3125, 0.3438, 0.375, 0.4063, 0.4375, 0.4688, 0.5, 0.5625, 0.625, 0.6875, 0.75 Impact Rated No Measurement System Fractional Inch Material - Machining High Speed Steel Primary Material Application Brass, Copper, Laminate, Steel, Plastic, Wood Finish - Machining TiN Step Increments 1/32 in, 1/16 in Shank Type - Machining Straight with Three Flats Sub Brand Unibit Series UNIBIT Number of Drill Bits 3