... Price(larger order, lower price) 2.Perfect Quality Control System 3.Excellent Sevice 4.Large Business scale COMPANY PROFILEHejian Huanyu Petroleum ... accord with API and ISO standards.Huanyu is registered with 3 million RMB capital, possesses over 180mu area and 70 ... 117 215 216 217 315 316 317 325 327PDC BIT(3 blades,4 blades,5 blades,6 blades)5 1/ ... /27 7/8,8 1/2,8 3/410 5/8,12 1/413 3/4, 17 1/2,22, 24 ...