Aitkens ladder system comes in two main depth formats 100mm deep (medium duty) or 125mm deep (heavy duty). The medium duty range is a standard stock item. Other depth options are available on request. The system conforms to BS EN 61537:2007 Cable management, cable tray systems and cable ladder system. Mild steel hot dip galvanised: manufactured from steel complying with BS EN 10025-2:2004 and hot dip galvanised after manufacture to BS EN1461:1999. Stainless steel grade (316) available on request.