Greenfield 2116-R PVC Coated Anchor Chain Anchor chain keeps anchor in correct setting position for stronger hold 5/16" x 4' PVC-coated marine anchor chain Recommended Boat Size (Winds up to 30 knots): 1.370 lbs Highly elastic PVC coating stretches to all chain to bend and coil For best performance, use this product with steel shackles to connect Anchor - Chain - Line