A full complete set up enough to transform even the largest trailers to rollers. Comprising of a total of 36 wobble rollers with polyurethane tyres for life long use, fitted onto fully galvanized boat trailer roller spindles and carriages. Now comes with universal bracketry and bolts that will fit all boat trailers. Larger carriages are fitted near to the boat stern and smaller ones near the boats bow. To save work these boat trailer roller carriages can be fitted straight onto the existing stems on your boat trailer. Stems are 40mm x 40mm box section, Boat trailer roller carriages are 40mm x 40mm box section.