The Quantum Storage Systems DB1836C modular dolly frame is made of chrome-finished carbon steel for strength, durability, and resistance to dirt build up and corrosion, accommodates four plate casters (not included) for mobility, and has corner bumpers to help protect walls and furniture from damage. It is suitable for use with a wire shelving unit (not included) that is 36 inches wide and 18 inches deep. This dolly frame measures 7 x 36 x 18 inches (H x W x D). (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.)Quantum Storage Systems manufactures storage bins and systems, and steel and wire shelving. The company is headquartered in Miami, FL.