... bits, rotary bit, TCI tricone bit, PDC drill bit , diamond core bit, bicenter bit, single cone bit , reamer bit, down hole ... supplier of new and used tricone, and PDC bits and core bits for use in the gas, oil and mining industries ... bit optional. Shapes can do chevron & step as requested. Sizes: 3 3/4", 3.7/8", 4", 41/4", 55/8 ", 47/8 ... ", 6", 7.3/8", 4.3/4",5.1/8", 5.5/8", 5.7/8", 6 ...