Master Mechanic, 29 Piece, Cobalt Drill Set, Ideal For Stainless Steel & Other Hard Metals, Also Recommended For Drilling Wood, Plastic, Wallboard, Plywood, Soft Metals, Aluminum, Brass, & Bronze, Set Contains: 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, 1/2", 3 Flats On Shank Reduce Slipping In The Chuck, 135 Split Point, Jobber Length, 3/8" Shank, Features 135 Split Point Angle With 4 Cutting Edges, Eliminates Walking & Provides Fast Penetration, Organized In A Durable Case, Clamshell.