Marine anchor chain 1.Material:CM490, CM690 2.Size: 17.5mm-130mm 3.Grade: U2, U3 4. All class certificate Stud anchor chain1. Material: alloy steel, carbon steel, CM490, CM690 or according to your requirement.2. Size: 17.5mm-130mm3. Grade: U2, U34. Surface: black paint, hot dip galvanize or according to customer's requirement5. Certificate: LR, ABS, DNV, BV, NK, GL, RINA, CCS, IRS, KR6. ...