This premium 29-piece Left Hand Cobalt Drill Bit Set is engineered for tough drilling applications and is especially effective for removing broken studs, bolts, and fasteners. Designed with a left-hand cutting direction, these drills apply natural reverse torque as they cut—often backing out damaged fasteners during drilling, without needing an extractor. Manufactured from high-speed steel enhanced with 5–8% cobalt, these drill bits deliver exceptional hardness, heat resistance, and wear life. They excel in demanding materials including red-hardened steel, stainless steel, and cast iron, while maintaining the durability and flexibility of traditional HSS—only with greatly enhanced performance characteristics. A 135° full-ground split point ensures fast, accurate starting with reduced walking, friction, and heat build-up, delivering an economical, efficient cutting action. Key Features Left-hand cut direction – ideal for drilling out broken studs and bolts; often removes the fastener while drilling. Can be used as standard drill bits where reverse-cutting is preferred. 5–8% cobalt alloy (M35 quality) for superior strength and performance in hard metals. Excellent heat resistance for extended tool life under high-temperature applications. 135° split-point tip for faster penetration, reduced wander, and improved accuracy. Fully ground construction for smooth cutting and long-lasting durability. Set Includes (29 Sizes) 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"
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