52-Bin double sided rolling storage rack with wheels. Features four heavy duty 3 inch castors (Two with Brake) and built-in side handle on frame for maximum maneuverability. Sturdy all steel rack with powder coat finish. Easy to clean bins, will not rust or dent. Bin sizes: 36 bins are 6-1/2 inch, by 4 inch by 3 inch. 16 bins are 9-1/4 inch by 6 inch by 5 inch.