Marshall Stamping Extend-O-Post JP84 Series Jack Post, 8000 to 12,000 lb, 4 ft 8 in to 8 ft 4 in

Extend-O-Posts are ideal for temporarily reinforcing existing floors under heavy load areas, but are not recommended for permanent supports in new construction. There's nothing easier to use for supporting sagging floors, weak beams and warping stairways.