tools for school locker shelf with adjustable width 8" - 12 1/2" and height 9 3/4" - 14". stackable and heavy duty. ideal for school, work and gym lockers (black) tools for school the tools for school locker shelf fits into almost any locker to keep you organized. with adjustable width and height, this customizable shelf can also be stacked to create multiple shelves. for additional strength, the sides of the locker shelf come affixed with small magnets that connect to the inside wall of a metal locker. this prevents the shifting and shaking that is common with other locker shelf designs. the heavy-duty weight capacity of 40 lbs. per shelf means you can place your books, bags and other items knowing they will safely hold. the tools for school locker shelf is available in black, blue and magenta. patent pending.