15 piece, Turbomax, turbo point, drill bit set, revolutionary tip design stays sharper longer & drills up to 28 percent faster, 3 flatted shank design provides better chuck grip & reduces slippage, ideal for use in keyless chucks, bit is constructed of m-2 high speed steel for strength, heat resistance & wear resistance, durable rubber-sided case for added impact resistance, set includes (2) 1/16", (1) 5/64", (2) 3/32", (1)7/64", (2) 1/8, (1) 9/64", (1) 5/32", (1) 3/16", (1) 7/32", (1) 1/4, (1) 5/16 & (1) 3/8" turbo point bits.