Sea-Dog Swivel Eye Bolt Snap Sea Dog Swivel Eye Bolt Snaps are designed for use with rope, chain, wire or cable. These snaps are constructed of die cast manganese bronze for corrosion resistance and durability and can be used for tie-downs, lifting wires or in other rigging applications. 360 degree swivel strap eye eliminates tangling. Spring-loaded bolts provide secure closure with the advantage of an easy-open thumb lever. Die cast manganese bronze; Dimensions: A: 3-5/16"; B: 7/16"; C: 1/2"; D: 11/16";