The 84 mm R4 Studless DNV Chain is a type of heavy-duty chain that is commonly used in marine and offshore applications, particularly for mooring and anchoring purposes.
"84mm" refers to the diameter of the chain, which is 84 millimeters. "R4" indicates that the chain has no studs or attachments, making it a "studless" chain. "DNV" stands for Det Norske Veritas, a Norwegian classification society that sets standards for marine and offshore equipment.
The chain is designed and manufactured to meet the DNV's standards for high-strength, low-weight chains suitable for use in demanding marine environments. It is made of high-tensile steel and is typically used in large, heavy-duty applications such as offshore oil rigs, ship moorings, and other marine structures that require secure anchoring.