SZ spacer, for VX, TS roof plate, H: 20 mm, Spacer for roof plate, Hexagon steel section, Zinc-plated, Assembly components, 20 mm, 0.79 in, 73269098, 4 pc(s), 0.476 lbs, 4028177022799, For raising the roof for ventilation purposes, available in three different heights. Not suitable for crane transport.