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Heavy-Duty Cobalt Drill Bits are best to drill tough, high-tensile materials and work-hardened materials like high-strength alloy, stainless steel, cast iron, copper, titanium, manganese steel, armor plate (AR Plate), iconel & much more. Cobalt drills will give you increased tool life over general purpose drill bits. Cobalt drill bits contain cobalt-alloy and can be sharpened relatively easy with cutting fluid while retaining their strength and durability due to the industrial-grade cobalt HSS construction. The cobalt increases the strength of the steel and makes it more heat-resistant. This is a critical factor in drilling hard materials because the friction of metal against metal can produce high temperatures that damage the material or the drill bit. The spiral flutes are constructed with a higher flute angle to remove chips more easily. The 135° split point provides stability in starting a hole for faster, easier drill penetration. Domestically manufactured, our Made In U.S.A. cobalt drill bits are supplied in jobber length and are available in a variety of sizes from 1/16" up to 1/2." They are sold individually, in full packs and in a 29 piece complete set that includes 1/16" to 1/2" by 1/64". Choose cobalt drill bits to increase productivity and maximize efficiency with high heat resistance & long wear life.