Feature 1Unique Design: The keel roller is designed with embedded grooves, to automatically center the boat while the boat rolls forward. 2Function: The shaft keel roller is designed to handle the added weight and impact of heavier boats, which has good flexibility, high strength. 3Important Parameter: The center aperture is 17mm/0.67in, the overall length is 160mm/6.30in, and the diameter is 60mm/2.36in. 4Material: The marine keel roller is made of high strength PVC material, which has good flexibility, anti deformation, durable, and heat resistant. 5Adaptability: The blue keel roller can be a replacement for trailer and boat, which is professional manufactured, ensure stable performance and high reliability.Item Type:KeelRollerMaterial: PVCCenterAperture: Approx.17mm/0.67inFitment:Suitable for trailerandboat .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x KeelRoller