Description Drill Bit Set? 115 PCS Drill Bit Set Includes? 29pcs Fractional Size: 1/16 to 1/2 inch bits in 1/64th increments; 26pcs Letter Size: A to Z, 60pcs Wire Size: #1 to #60, Metal index storage box for easy carry and organizing. A Must For Professionals? Whether a professional woodworker, handyman, or construction worker, or you simply enjoy the occasional house project as a relaxing hobby, the metal drill bit set for steel are an excellent assortment for ensuring perfect holes and plugs! Heavy Duty Construction? The drill bit is made with durable material containing 5% Cobalt alloy steel, which ensures long-lasting use and superior wear resistance! Suitable for cutting stainless steel, cast iron, high-temperature alloy, titanium alloy, hard plastics, and wood. Versatile Functions? Featuring a 135-degree split point with a round straight shank, an intelligent self-centering design that prevents walking, fully ground twist design ensuring a cooler drilling performance by decreasing friction, The 115pcs impact drill bit set easily drills through a wide variety of materials. Practical and Portable? Say goodbye to constantly losing or misplacing your drill bits! The drill bit set for metal comes with an ergonomic and portable metal size index storage box with a built-in clip, easily attaching to your tool belt and keeping your bits within immediate reach!