JFATXTT 5" Boat Trailer Roller with Brackets,Assembly for 3" Trailer Tongue Frame,Galvanized Steel

["Our boat trailer keel roller assembly is made of high-density marine-grade PU roller and thick galvanized steel bracket, built to resist rust, corrosion, saltwater exposure and road vibration for long-lasting durability.","The high-performance PU roller ensures ultra-smooth launching and towing, greatly reducing friction and preventing scratches or wear on your boat’s hull, extending the service life of both your vessel and trailer.","This upgraded blue boat trailer roller enables easy installation and disassembly, saving you time and labor on trailer maintenance.","Galvanized steel bracket fits 3\" trailer tongue frame. Spacing of mounting holes: 1.77\" apart on center. Mounting slots: L 0.62\" * W 1.29\";Bolt: L 4.3\"* W 0.47\". If the included mounting bolts don't fit your trailer's holes, you may need to purchase additional bolts.","Ideal for fishing boats, small yachts, pleasure craft and recreational vessels, it provides stable keel support and reliable performance for all your boating and trailering needs."]