... mould according to the mouth piece and coupling.we have our own mould workshop. ... release of the protectors from tube/casing during transport.The composite type thread ... casing wrench.Sizes:1.315,1.9,2 3/8",2 7/8",3 1/2",4",4 1/2",5",5 1/2",6 5/8 ... ",7",7 5/8",8 5/8",9 5/8 ... ",10 3/4",11 3/4",13 3/8 ...