... frictional welding water well drilling equipment 2, Grade: E-75, X-95,G-105,S-135 3, length: R1,R2 ... the Jinzhou orient prospecting apparatus Co.,Ltd difference.we stand out beacuse of the points as follow:1. ... meeting API 5DPOwn facility:API, ISO standerd (alloy steel E.X.G.S)OD :2 3/8,2 7/8 ... IEU1, frictional welding water well drilling equipment2, Grade: E-75, X-95,G-105,S-1353, length: R1,R2,R34 ...