Our new design of boat trailer roller bunks to roller conversion kit is universal and comes in 3 different sizes. Its simple to fit and only takes minutes. It replaces the existing skids / bunks using either the trailers existing brackets and uprights or using the new ones supplied. Fully galvanized construction, polypropylene wobble rollers that do not mark the boat, fully adjustable mounting brackets, c/w bolts, split pins all ready to go. Sold in pairs, a pair of 4ft boat trailer roller bunks with fittings.