TUF Ship / Marine / Offshore Stud Link Anchor Chain is compliant with ISO 1704 and IACS W18 and can be used on big ship. Stud link anchor chain is 20% stronger than studless link chain with same size. And the links of stud link chain is not messing with each other in storage. So they are ideally option for ship anchor chain. Available Types: Galvanized type Black coated type U2 (grade 2) or U3 (grade 3) stud link anchor chain Diameter: 12.5mm to 140mm Approvals: ABS, CCS, DNV-GL, KR, NK, RM-RS, RINA, BV and etc.