1, frictional welding water well drilling equipment 2, Grade: E-75, X-95,G-105, ... beacuse of the points as follow:1. Longway is a real manufacturer of drill pipes in China and has its own ... /2,5(inch)UPSET: IU,EU, IEU1, frictional welding water well drilling equipment2, Grade: E-75, X-95,G-105,S ... .795.000127.0 mm0.50012.70 mm frictional welding water well drilling equipment