The slots in the tray allow for good airflow and, at the same time, offer a selection of fixing positions to allow modems and instruments to be screwed into position With this style of tray a pair of chassis supports is also required For 600mm wide units fitted on chassis supports, and in turn on panel mountings, four panel mountings must be fitted 1.5mm steel Light grey RAL 7035 finish Load rating and safety specification 50kg