1, frictional welding water well drilling equipment 2, Grade: E-75, X-95,G-105, ... 1/2,5(inch)UPSET: IU,EU, IEU1, frictional welding water well drilling equipment2, Grade: E-75, X-95,G-105,S ... .0335.795.000127.0 mm0.50012.70 mm frictional welding water well drilling equipment