1Rubber 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. 2Reliable 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. 3Excellent Durability: Engineered for durability and compatibility, these rollers are ideal replacements for most trailers, providing reliable performance. 4Wide Compatibility: Compatible with 8 inch trailer roller panels and featuring a 17mm center aperture, the bow roller is suitable for boat trailers and yachts. 5Easy to Install: The roller bow stop has a simple installation, convenient and effort saving, don't need too much tools or complicated steps. 1 xHeavyDutyTrailerBoatRoller