Product Details:

This CRL Kik-Step is a heavy-duty rolling step stool that no warehouse, factory or shop should be without. Just roll it into place, stand or sit on it, and roll it out of the way when you're through. Upper Platform: 11 inches (279 millimeters) Diameter
Lower Platform: 13-1/2 inches (343 millimeters) Diameter
Base: 15-3/4 inches (400 millimeters) Diameter
Height: 14 inches (356 millimeters)