Patented, recessed and concealed lock protectors for maximum security against drilling and cutting lock. Enhanced lid bolster for added support and durability. Finger-groove lid handle for easy opening. Convenient storage tray on back wall for small items (except Model 1332). Steel support arms to hold lid in open position. Heavy-duty piano hinges with non-removable pin. Large, fold-down recessed handles for convenient lifting. Built-in 3-1/2" high skids with holes for easy caster installation. Optional casters are available separately for easy mobility.