... standard:API5CT 3.OIL DRUM COVER AND METAL WIRE COVER 1.Product basis:A-Rolled steelB- ... The products is smooth, no discontinuous screw thread, no impurity, no slip, and no felting ... tubing,casing, pipe, aiming to protect the thread of them, in case of being damnified due ... ” petrol tubing,casing, pipe, drill shrank, bushing thread protector all ready, and manufacture special fastener according to ...