TOOL BOX DIMENSIONS-The measurements shown in this Catalogue are approximate and shown as the following: Length(L), Width(W), and Height(H), and are shown in the table below each catalogue entry. Steel tool boxes and cabinets-The drawers and storage space are measured showing the "internal" dimension, ie. that inside the box or cabinet. This gives a more accurate assessment of the area inside the products-as the steel used to mark the metal boxes can be up to 3 or 4mm tick. Plastic tool boxes, steel storage cabinets and tool cases-These are measured showing the "external" dimension, ie. that outside. Generally these are made form thinner materials and the internal measurement is not as critical.