Metro L18N-4S Super Erecta Stainless Steel Stackable Ledge 18" x 4"

The four inch versions of these shelf holders are excellent at providing support for taller items. I use these on shelves with large breakables, because while the one inch versions work, the extra three inches provide significantly more stopping power for tall items when a rack is bumped or shakes (say, during an earthquake). For the extra cost, if you have the height available, I strongly recommend these over the one inch versions.

This stackable ledge is easy to use and holds up well. The chrome looks great but is also very functional in keeping products on the shelf.

These ledges really do a great job keeping items from falling off shelves. The higher height (4 inches vs. 1 inch) compared to their smaller counterpart really helps with bigger, taller, or heavier items. Very useful on edges of carts to keep things from sliding off while moving them.