Drill Hog 26 Pc COBALT M42 Letter Drill Bit Set USA Includes: 26 Letter Sizes A to Z Sizes: A (0.234), B. 0238, C (0.243), D (0.247), E (0.250), F (0.257), G (0.260), H (0.266), I (0.271), J (0.275), K (0.281), L (0.289), M (0.295), N. These bits are made from NIOBIUM Steel which has a melting point of 4,476 degrees Fahrenheit! These bits will drill through the toughest steel like truck frames, stainless steel, farm implements, spring steel, grade 8 bolts, and more!