This is a food can rotation system, you put new cans in the top and take old cans from the bottom.
It is designed to fit cans up to 4" in diameter and up to 5" tall. It will fit around 12 cans that are 4" in diameter (e.g. diced tomato cans, 6 per slot) and around 20 cans that are 2 1/2" in diameter (e.g. soup cans, 10 per slot).
See my other items for a cheaper to cut cardboard version.
Assembled dimensions are 10"x11"x15"