The generous throat openings of these shackles makes them ideal for use with web slings, especially if your web slings have flat eyes (wider than tapered / twisted eyes). They are made from forged alloy steel and feature a galvanized finish for durability and longer wear life. The load pin is held in place with a bolt and linchpin setup making it very secure. Working Load Limit is clearly marked on each shackle. Safety factor of 4:1.