This rack is designed to hold 6 sets of quick-change rear end gears standing on edge and easily accessible. Since the gears are stored open and uncovered, it is easy to see which ratio you are grabbing. Two gearsets (4 gears) fit on each shelf. Each gear fits in its own pocket to minimize contact with other gears. Measures 17 1/2" wide x 22" high x 2 1/2" deep.