... , RQ4, 2) Material: Alloy steel 3) Finish: Black tar Painted stud link mooring link chains 1) Grade U2,U3, ORQ, RQ3, RQ4, 2 ... ) Material: Alloy steel 3) Finish: Black tar Paintedstud link mooring link chains1) Grade U2,U3, ORQ, RQ3, RQ4,2) Material ... , KR, BV, GL, CCS, NK, mill test cert, etc.,5) Chain Dia. Sizes: 34mm till 162mm