Features: Designed specifically for yacht and inflatable boat keels, this trailer roller provides stable support by distributing weight evenly during transport, preventing keel deformation while ensuring precise alignment with trailers for smooth loading/unloading. Crafted with corrosions resistant galvanized steel/ABS brackets and soft rubber/PU rollers, the adjustable height assembly features multiple positioning holes to accommodate various vessel sizes without scratching marine grade coatings. Ideal for boat owners, marine transport professional, and watersports enthusiasts requiring equipment to safely move vessels between trailers and launch sites. Essential for coastal marinas, lakesides docks, or personals storage facilities where low friction rolling significantly reduces manual effort during boat transfers using winches or hand guided operations. Engineered with standardized bolt on installation and heavy duty bearings, this marine grade roller systems withstands prolonged saltwater exposure and road vibrations, maintaining structural integrity through years of use. Specifications: Component:ABS,Metal Type:Trailer Roller,2Pcs Trailer Roller + Axles,2Pcs Trailer Roller + Axles + Clip Package Includes: 1Set Boat Trailer Roller note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item. Designed specifically for yacht and inflatable boat keels, this trailer roller provides stable support by distributing weight evenly during transport, preventing keel deformation while ensuring precise alignment with trailers for smooth loading/unloading. Crafted with corrosions resistant galvanized steel/ABS brackets and soft rubber/PU rollers, the adjustable height assembly features multiple positioning holes to accommodate various vessel sizes without scratching marine grade coatings. Ideal for boat owners, marine transport professional, and watersports enthusiasts requiring equipment to safely move vessels between trailers and launch sites. Essential for coastal marinas, lakesides docks, or personals storage facilities where low friction rolling significantly reduces manual effort during boat transfers using winches or hand guided operations. Engineered with standardized bolt on installation and heavy duty bearings, this marine grade roller systems withstands prolonged saltwater exposure and road vibrations, maintaining structural integrity through years of use.