Heavy duty grilles designed to adapt to most popular stable sizes, or to provide limited openings between stables. intended to fit on top of wooden or masonry walls they are strongly constructed from 75mm wide steel flats top and bottom, with 22mm diameter tubular bars set at 76mm centres. Jointing is by means of connector plates bolted on above the top frame and below the bottom. all 76cm high and hot dip galvanised. Very substantial.