The Edsal UR185P-BLK 5-shelf freestanding shelf unit has 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. This unit has double-riveted beams that lock into double-rivet holes on the corner post for structural security. The corner post rivet holes on this unit are punched at 1-1/2 in. intervals for precise adjustment to desired shelf height. The steel rack has a black powder coat finish to resist corrosion. This unit is open on all 4 sides to facilitate access to shelf contents from any angle. The posts on this unit have a 2-piece design so it can be assembled vertically to create one 72 in. H x 36 in. W x 18 in. D unit or assembled horizontally to create two 36 in. x 36 in. x 18 in. units, 1 unit with 2 shelves and 1 unit with 3 shelves. (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.) This shelf unit has a rivet lock design for boltless assembly. Assembly instructions are included. A rubber mallet (sold separately) is recommended for assembly.. Assembly Required: Yes. Assembly Type: Full Assembly Required. Color Family: Black. Color/Finish: Black Powder Coat. Features: Adjustable. Frame Material: Steel. Included: No additional components or accessories are included. Number of Shelves: 5. Package Quantity: 1. Product Weight (lb.): 74 lb. Returnable: 90-Day. Shelf Material: Wood. Shelf Type: Solid. Total Weight Capacity (lb.): 4000. Wood Tone: Medium Wood. Assembled Depth (in.): 18 in. Assembled Height (in.): 72 in. Assembled Width (in.): 36 in. Shelf Weight Capacity (lb.): 800 lb. Shelf Material: Wood. Shelf Weight Capacity (lb.): 800 lb. Wood Tone: Medium Wood