Labeling is a crucial part of the 5S Lean process of setting things in order. Every item, and location where items are set, should be clearly labeled so no time or effort is wasted searching.
When time is critical, semi-permanent label holders are perfect for keeping supply areas up-to-date on their labeling: holders with magnets, adhesive backing, or even specialized mounting for use on wire racks make it easy to see where items belong.