This 29-piece M35 cobalt drill bit set is engineered for demanding drilling applications involving hardened and high-tensile materials . Manufactured from premium M35 high-speed steel with 5% cobalt , these drill bits offer superior heat resistance, increased hardness, and longer service life compared to standard HSS bits. Each drill bit features a 135-degree split point tip that is self-centering to reduce walking and improve drilling accuracy. The fully ground twist flute design enhances chip removal, reduces friction, and minimizes heat buildup for smoother, more efficient drilling performance. This set includes 29 fractional sizes ranging from 1/16 inch to 1/2 inch , providing versatility for precision and general-purpose drilling tasks. M35 cobalt steel is especially effective when drilling stainless steel, cast iron, hardened metals, high-temperature alloys, titanium alloys , and is also suitable for plastics and wood when needed. All drill bits are neatly stored in a durable metal index case , allowing for quick size identification, secure storage, and convenient transport. Sizes Included (29 Pieces) 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"" Key Features Material: M35 high-speed steel with 5% cobalt Tip Design: 135 split point for self-centering starts Flute Type: Fully ground twist for efficient chip removal Shank Type: Straight round shank Applications: Stainless steel, hardened metals, cast iron, alloys, plastics, and wood Storage: Metal index case for organization and durability