Contractors Evaporator Hanging Bolt Set 300mm (4 x M10 or M12 vinyl inc washers , nuts & caps)These dome headed nylon bolts also known as buffalo bolts are ideal for hanging evaporators to coldroom roofs or hanging door frames to coldrooms. Because they are nylon they don't transmit the cold from inside the coldroom to the outside and thus prevents ice build up on the exterior. 300mm lengths. Complete with nut washer and cover.