Drill America Contractor Grade drill bits are black and gold surface treated and manufactured from M1 High Speed Steel. They are for use in a wide range of materials in the iron and steel families such aluminum, iron, steel and other metal drilling. Drill America Contractor Grade drill bits have a 135° split point tip for fast penetration and accurate drilling. Compared to a conventional 118° tip, these drills wont go in. walking in. on you. 3-Flat shank creates an extra secure hold in your chuck. Drill America Contractor Grade 29-Piece Drill Set comes in a round water-proof case. This unique round drill case combines form and function into 1 beautifully designed, easy to carry drill set. You can effortlessly grip the set in one hand as you would a travel coffee mug or leave it in the cup holder of your truck while on the way to a job. 29-Piece set includes sizes 1/16 in., 5/64 in., 3/32 in., 7/64 in., 1/8 in., 9/64 in., 5/32 in., 11/64 in., 3/16 in., 13/64 in., 7/32 in., 15/64 in., 1/4 in., 17/64 in., 9/32 in., 19/64 in., 5/16 in., 21/64 in., 11/32 in., 23/64 in., 3/8 in., 25/64 in., 13/32 in., 27/64 in., 7/16 in., 29/64 in., 15/32 in., 31/64 in. and 1/2 in.