... 2.Fast drilling rate 3..size rang from3"1/2-26" 4.Certification: API & ISO9001 5 ... Type6"(152mm), 6 1/2"(165mm), 8 1/2"(215.9mm), 9 1/2"(241.3mm), 12 1/4"(311mm) , ... , 14 5/8"(371mm), 15"(381mm), 17 1/2"(445mm), 24"(609mm), 26"(660mm)IADC 147,437 ... 547 (HJ or HA)KN/mm 0.5~1.20R/min 100~50Applicable Formations/layer Low compressive ... 436 446 447 516 526 537 547 516 536 535available sizes:From 2 7/8 to 26 ...