... specifications of the American Petroleum Institute (API6A, 16A) certification and national industrial production permit BOP. Our main products include ... /4, 6-5/8, 7, 7-5/8, 9-5/8, 9-7/8 and 10-3/4″), blind, shear and variable RAM (2- ... 7/8 to 5, 4- ... 1/2-7”), and ...