Accusize Industrial Tools 9/16'' Ansi M35(H.S.S. + 5% Cobalt) S And D, 0916 ANSI M35 (H.S.S. + 5% Cobalt) Drill, with Silver Deming shank, Gold and black oxide coating for corrosion resistance. 9/16'' Cutting Diameter; 1/2'' Shank Diameter; Straight shank with 3-Equal-flats to fit 1/2" chucks 6" overall length with 3" flute length; With aggressive 135 split points, these cobalt drills bits not only last longer while drilling but also cut faster than standard high-speed steel bits. It's ideal for drilling cast iron, heat-treated steel, stainless steel and other hard materials. High-Quality M35 H.S.S. + 5% Cobalt: Designed for enhanced durability and superior heat resistance, suitable for drilling hard materials. 135 Split Point for Efficiency: Sharp, precise tip reduces drill bit walking and eliminates the need for a pilot hole, improving accuracy. 1/2" Shank with 3-Equal-Flats: Ensures a strong grip in 1/2" chucks, preventing slippage for reliable, consistent drilling performance. Optimal Length and Flute Design: 6" total length with a 3" flute length provides a balanced approach to reach and power in drilling tasks. 9/16" Drill Bit Size: Ideal for versatile drilling applications, from DIY projects to industrial manufacturing tasks.