... :CCS, ABS, etc. u3 and u2 marine anchor chain Originally studs were added to the chain to stiffen the links preventing them from ... , 2 and 3 stud & open link chain; marine anchor: Hall anchor, Japan Stockless Anchor, U.S.N Stockless Anchor and other marine castings, like Panama ... open end links, welded swivel assemblies, D type anchor shackles. Open Link Chain Diameter: 1/2 to 2-3/4 inches, 12 ...