This jack system enables you to support materials (crown molding, drywall, etc.) overhead and to create dust barriers Single jack can support up to 150 lb and extends from 57" (closed position) to 144" (fully open position) Ergonomic pump handle adjusts jack in 1/2" increments Top and bottom feet are 3" x 3" and articulate to provide a wide array of support variations Standard Pack icludes: (2) 3rd Hands, (4) Universal Feet and (1) Standard Carrying Bag