u3 and u2 marine anchor chain 1.Material: U1, U2, U3 2. Type: Open and Stud 3. Certificates:CCS, ABS, etc. u3 and u2 marine anchor chain Originally studs were added to ... when chain is retrieved with a windlass.1. Material: U1, U2, U32.Certificate: CCS, ABS, LR, GL, DNV, NK, BV, KR, RINA3. Surface: Galvanized ...