Milwaukee 48 89 9223 Step Drill Bit Set 31 Hole Sizes, 1 8 in to 1 3 8 in, Black Oxide Finish, Fractional Inch 1L097 Sodium Hydroxide Caustic Soda (20%) Sodium Hydroxide Caustic Soda (20%) Sockets and Accessories 375 Shank Type Machining Straight with Three Flats Drill Bit Case Type Plastic Number of Drill Bits 4 Flute Type Spiral Sub Brand Secure Grip(TM) Drill Bit Point Type Conventional Point Spiral Direction Right Hand Package Quantity 1 Material High Speed Steel Item Step Drill Bit Set Finish black oxide Measurement System Fractional Inch Number of Pieces 4 Material Machining High Speed Steel Number of Flutes 2 Finish Machining Black Oxide Shank Type Hex Cutting Direction Right Hand Step Thickness 5 32 in