Inboard end for 32mm standard boom (for EX1030). Optiparts owns several moulds for producing custom end fittings. All boom end fittings are made of high quality glass fibre filled nylon. Unlike inboard Optimist boom end fittings from other manufacturers ours have a firm grip around the mast.This ensures that mast and boom always turn together. Diameters given are outside tube diameters.