... or shaffer 4.Certificate:API 16 Renqiu City ... 8, 2-7/8, 3-1/2, 4, 4-1/2, 5, 5-1/2, 5-3/4, 6-5/8, 7, 7-5/8, 9-5/8, 9-7/8 and 10-3/4″), blind, shear and variable RAM (2-7/8 to 5, 4-1/2-7 ... ”), and double hole RAMPressure: 2,000 to 15,000psiSize: 7-1/16 ... to 21-1/4 ...