Bit size Inch (in) 5 7/8 6 61/8 6 1/4 7 7/8 8 3/8 8 1/2 8 3/4 9 1/2 9 5/8 9 3/4 9 7/8 12 1/4 13 3/4 Metric (mm) 149.2 152.4 155.6 158.7 200.0 212.7 215.9 222.2 241.3 244.5 247.3 250.8 311.1 349.2 Bit type 437 437 437 437 447 417 417 417 417 417 417 417 417 417 517 517 517 517 517 437 437 437 437 437 437 437 437 437 537 537 537 517 517 517 517 517 517 517 517 517 617 617 547 537 537 537 537 537 537 537 537 637 637 617 617 617 617 637 637 637 API Regular Pin (in) 3 1/2 4 1/2 6 5/8 Recommended make-up torque for bit shank (KN.m) 9.50-12.2 16.30-21.70 37.93-43.30. Carton or box.