Investment Cast Halyard Shackle has a double-threaded pin that prevents loss, but may be removed if desired. Choose between the rope halyard shackle, flared at halyard hole to prevent chafe, or the wire halyard shackle with removable head pin for prespliced wire eyes. Investment cast Type 316 stainless steel Pin Diameter Rope: 7/16'' Pin Diameter Wire: 3/16" Interior Clearance: 3/4''W x 1 5/8''D SWL: 4500lbs