Laboratory Jack With Platform And Rod Laboratory support jack is constructed of chemically resistant anodized aluminum and stainless steel. The scissor jack design enables height adjustment with a simple turn of the knob. Sturdy design can support loads up to 100 pounds. Lab jack platform measures 4.5" x 5.5". Platform height can be vertically adjusted from closed position of 2.75" up to 10.5". Set includes a removable 8" x 8" platform that attaches to the lab jack using the included 18" long, 1/2" diameter support rod.