Extra Shelves To Suit First Aid Cabinets Spill retaining, easy fit, adjustable shelves for use in First Aid Cabinets. Can be used to add extra storage levels and add extra application. Choose from 3 sizes: 350mm(w) x 300mm(d) Shelf 460mm(w) x 460mm(d) Shelf 900mm(w) x 460mm(d) Shelf