Heavy-duty 4 ft x 4 ft quick assembly tray stand. Absolutely no tools required. Can be assembled in 5 minutes or less. Accommodates all popular brand (ID) inside dimension trays and reservoirs including Flo-n-Gro®, Duralastics®, Botanicare® and more. Overall height is 25 in. Height from bottom bar to floor is 18 in without casters. Outside dimensions: 53 in length x 53 in wide. Inside dimensions: 51 in length x 51 in wide. Tray sold separately and may fit differently depending on brand.