Classical" or "collars" spreader base are attached directly outside of the mast, on the wider
surface of the section.
The Racing" models are made in aluminium to reduce weight while maintaining high resistance efforts.
The spreader bar (boomerang type) crosses the section required for better spreader arrows while limiting their games.
With this system, lower and inter shrouds are fixed directly on the spreader fittings base (stainless steel).
You get a superior esthetic finish.