1,bit API& ISO 2,bit size 8 1/2 215.9mm 3,bit iadc code 517 4,bit rubber/journal sealed bearing 4,bit FOB price: 850$/pcs Hejian Fist Petroleum Equipment Co., Ltd we have been in line with the principle of "faith-based, quality of survival and mutual benefit, provides the highest quality products and attentive service for our customers". We are looking forward to establishing relationships with ...