Harken's Cast Pad Eye is used for mounting blocks and serving as an attachment point for staysails, reefing blocks, and a zillion other uses. To get the maximum holding strength out of your pad eye, always align it with the load. The H689 is 3 7/8 in. (82mm) long and has an eye height of 1 9/16 in. (40mm), and a safe working load of 8,500 pounds (3864kg).