The Edsal UR185L-BLK five-shelf standing shelf unit has a 16-gauge steel rack and shelves made of particle board to support an 800-lb. per shelf capacity and a 4000-lb. total capacity when the weight is distributed evenly across all shelves. The posts on this unit have a two-piece design so it can be assembled vertically to create one 72 x 36 x 18 inch (H x W x D) unit, or assembled horizontally to create two 36 x 36 x 18 inch units, one unit with two shelves and one unit with three shelves. Standing shelf units are commonly used to store items to help create organized, efficient, and safer work areas.