Bolt-Down Fairleads are used as shallow-angle line deflectors on boats 20' to 50'. These weight-saving fairleads are built of 6061-T6 Hard Lube-anodized aluminum for durability. Smooth surfaces and radiused center holes minimize line wear.Length: 4 3/4"Width: 7/8"Height: 1 1/4"Maximum line Diameter: 9/16"Center hole Diameter: 16mm (5/8")Weight: 3.95oz.Fasteners: Two 5/16"Maximum working load: 4,000lb.Breaking load: 8,000lb.