Transparent (allows you to see the contents) polypropylene storage boxes. Supplied complete with lids. Locking mechanism to prevent the lid separating from the base. Working temperature of -15°C to +80°C. Ideal for filing or archiving. Positively stack with or without the lids. Minimal wall taper to maximise storage capacity. Totally flat and reinforced bottom. Will inter-stack with different capacity boxes. Has a integral lip, allowing suspension files to slide.