The thickness refers to the height of the rim; the base of the tray is always 2mm thick to minimise the height of the whole. The rim is 2mm wide at its narrowest part and the holes have an additional 1mm margin.
Each combination of ranks, columns and thickness contains 1 movement tray. If you need trays of any other size you can order them here.
The MDF of this product meets the requirements of Class E1 (low formaldehyde emissions) as defined by the European Standard EN 622-1:2003.