What does 9 inch 12 inch and 15 inch locker sizes mean you were looking for locker shelving and there was a shelf that said it could be adjusted to fit lockers of that size?

The sizes 9-inch, 12-inch, and 15-inch refer to the width of the lockers, indicating the space available for shelving. A shelf that can be adjusted to fit these sizes means it can be customized to fit snugly within lockers of varying widths, providing versatility for organizing items. When choosing a shelf, ensure it is compatible with the specific locker dimensions you have.