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 can cancel the order for any reason and at any time. Make sure you provide a correct address because it will no longer be possible to change it later. You have 30 days to return at your expense. If there were delays they could be caused by couriers and not by us. Thank you for choosing us!