These are jigs to help cut sheets of suitable plastic and bends lengths of suitable metal wire to construct tarpaulin hoods for the 7mm:1ft model of the coil-carrying cradles for the converted Warflat wagon. The tops of the sheet patterns have raised oblongs to bend the wires around so that each one is a little bigger than the next, and fits over it in the bar mouting points at the ends of the cradles. They are unfortunately rather expensive in any plastic so you may prefer to do without or make your own from card or wood.