115 Pc Drill Bit Set Cobalt M42 Fractional Letter Number. Super Premium Cobalt M42 Steel. 1/16″ to 1/2″ Fractional Sizes by 1/64ths. A to Z Letter Size Drills. #1 to #60 Number Drills (Wire Gauge Sizes). Drill Hog is proud to release the newest technology in drill bits. These bits are made from COBALT M42 Steel which has a melting point of 2,723 Fahrenheit! These bits will drill through the toughest steel like truck frames, stainless steel, farm implements, spring steel, grade 8 bolts, and more! Tired of not having the right bit for the job? Did you know there are “in-between” sizes between the regular fractional sizes? This complete master drill index solves the problem! This set includes fractional sizes, letter sizes, and number (wire gauge) sizes all on one set! We offer the best prices around on high quality products. Our E-store includes media such as books, movies, music and games while offering electronics, toys, sporting apparel, clothing, tools, general home, garden items and more. We are always working hard to ensure your package arrives as soon as possible. We do not accept P. Please provide a physical address. We try our very best to make sure every customer is completely satisfied. If there’s a problem, message us! We’re happy to help.