Greenfield&';s unique, specially formulated, highly elastic PVC coating stretches to allow chain to bend and coil easy. Anchor chain is essential for safe anchoring, providing weight between the anchor and rode to ensure proper position when setting an anchor. a Anchor chain keeps anchor in correct setting position for stronger hold a 5/16" x 4&'; PVC-coated marine anchor chain a Recommended Boat Size: 1,370 lbs a Highly elastic PVC coating stretches to all chain to bend and coil