... Diameter (mm)75bore of stem mm(in)752 15/16Connection Screw ThreadConnect to Center Pipe APIREG 4 1/2,LHConnect to ... system need 90days to manufacture ,these rig parts include: hoook ,swivel, travelling block,rotary table,crown block :ples give us enough ... time for good quality. Swivel,NOV Copy, experience manufacturer,Honghua,Baoji,LSNOW exchanged,warehouse supply ...