Originally studs were added to the chain to stiffen the links preventing them from severely deforming when overloaded. They have the added advantage in that they prevent the chain from knotting up when twisted, thus avoiding problems when chain is retrieved with a windlass. We can also provide grade 1, 2 and 3 open link chain; marine anchor: Hall anchor, Japan Stockless Anchor, U.S.N Stockless Anchor and other marine castings, like Panama Chock, Fairlead Roller, and so on. With ISO: 9001 Quality Management System, SMC can offer you best quality as well as services.