38x25mm Treated Graded Roofing Laths. Commonly known as tile laths. 38x25mm section. Nominal 1½x1". Pressure treated, graded roofing battens. Always put glass onto timber laths, equally spaced for the piece of glass, so the weight is evenly distributed.Never put the glass down directly onto concrete, or other hard flooring, as this will break the glass.
eBay