Polyform U.S. 1-1/4in Shackle - Galvanized Steel Galvanized Steel. The 1-1/8" plastic PVC insert helps distribute the load over the entire rope hold area for maximum performance and longevity. Safe working load limit: 5000 lbs. Specifications for Polyform U.S. 1-1/4in Shackle - Galvanized Steel: Manufacturer: Polyform U.S. Line Application: Anchor Fabric/Material: Galvanized Steel Color: Silver Package Contents: Polyform U.S. 1-1/4in Shackle - Galvanized Steel Polyform U.S. 33-957-400: 1-1/4in Shackle - Galvanized Steel Galvanized Steel