Handle-actuated release valve system for precise load control. Extra-heavy gauge side frame. Wider wheels for added strength. Rolls on 2 1/4in. diameter casters. Lift Capacity (tons): 2, Min. Lift Height (in.): 5, Max. Lift Height (in.): 20, Safety Valve: Yes, Dimensions L x W x H (in.): 30 3/8 x 13 3/8