Feature: 1. Rubber Material: The boat rollers are made of quality rubber, hard, robust, and elastic, not easy to fray, providing long lasting performance and protecting your boat from scratches. 2. Reliable Protection: The boat trailer roller assembly is designed to prevent your boat from scraping against screws or roller brackets, helping to center the boat during launching or recovering, providing added protection for your boat's hull. 3. Excellent Durability: Engineered for durability and compatibility, these rollers are ideal replacements for most trailers, providing reliable performance. 4. Wide Compatibility: Compatible with 8 inch trailer roller panels and featuring a 17mm center aperture, the bow roller is suitable for boat trailers and yachts. 5. Easy to Install: The roller bow stop has a simple installation, convenient and effort saving, don't need too much tools or complicated steps. Specification: Item Type: Trailer Roller Material: Rubber Size: Approx. 19.05 x 8.41cm / 7.5 x 3.31in (L x W) Application: Compatible with 8 inch trailer wheel panels Center Aperture: Approx. 17mm / 0.7in Fitment: Suitable for Boats, Trailers, and Yachts . Package List: 1 x Heavy Duty Trailer Boat Roller