Our advantages:
1, we are factory, both price and quality are guaranteed.
2, Rich experience in drill bit
2, models complete
3, Flexible ways of doing business with our partner
4, bulk stock which ensure fast delivery
6, best after-sales service

Welcome to order and to visit our factory.

Available Size:

60mm, 65mm, 76mm, 93mm, 95mm, 98mm(3 7/8"),
101.6mm, 114mm, 118mm, 120mm, 127mm(5")

130.1mm(5 1/8"), 133.3mm(5 1/4"), 139.7mm(5 1/2"),
142.8mm(5 5/8"), 149.2mm(5 7/8")

152.4mm(6"), 155.5mm(6 1/8"), 158.7mm(6 1/4"),
161.9mm(6 3/8"), 165.1mm(6 1/2")

190.5mm(7 1/2"), 193.6mm(7 5/8"), 200.0mm(7 7/8")

212.7mm(8 3/8"), 215.9mm(8 1/2"), 222.2mm8 3/4")

241.3(9 1/2"), 244.4(9 5/8"), 250.8(9 7/8")

269.8(10 5/8"), 295.3(11 5/8")

311.1(12 1/4"), 346.0 (13 5/8"), 349.2(13 3/4")

374.6(14 3/4")

381(15"), 393.7(15 1/2"), 406.4(16")

444.5(17 1/2"), 508(20"), 558(22"), 609.6(24")

660.4(26")

IADC CODE
116 117 126127 136 137 216 217 226 226 316 317
326 327 336 337 115 125 135 215 225 235 315 325
335 114 124 214 314 111 121 131 346 347

417 427 437 517 527 537 617 627 637 737 837 832
415 425 435 445 525 625 635 416 427 436 446 447
516 526 537 547 516 536 535