material:GR1,GR2,GR3,GR4,GR5,GR7,GR11 Size: OD5.0- ... .(4)Moreover, we adopt ultrasonic testing to guarantee high quality.(5) Other available material:Gr1,GR2,GR3,GR4,GR5,GR23(6)specication:ASTM ... 5.Advantage:* we are manufacturer, best delivery and good quality is guaranteed.* high quality , competitive price.*advanced detection equipment such as :ultrasonic flaw ...