4 1/2" 07499450
5" 07499500
5 1/2" 07499550
6" 07499600
6 1/4" 07499625
6 1/2" 07499650
7" 07499700
Jining Donghong Machinery Co., Ltd
www.dhparts.com
spareparts1960@foxmail.com
dh@dhparts.com
Mobile/WhatsApp: 0086-18954079939
Skype: spareparts1960
API OSHA IADC OPEC RIG ZONE WORLD OIL Drilling Formulas
