... Hebei Province, China. We are a professional manufacturer of oil drilling equipment and accessories based on integrated petroleum machinery. We have obtained ... the technical specifications of the American Petroleum Institute (API6A, 16A) certification and national industrial production permit BOP. Our ... 3/4, 6-5/8, 7, 7-5/8, 9-5/8, 9-7/8 and 10-3/4″), blind, shear and variable RAM (2- ...