Designed with a unique self-locking block, meaning loads can be raised by one person without stress. SkyDock Storage System 4 to 1 Reduction Up to 175 LBS 4-Point Lift If the control line is released the locking block firmly holds the load, stopping items from falling. Designed for use in any space with a ceiling height up to 13' 4 M, the SkyDock works in garages, sheds, barns, and lofts for commercial uses in yards, marinas, yacht clubs and warehouses. Utilizing a 4:1 purchase system, It smoothly lifts bulky and awkward objects or loads, out of the way, from the floor or roof of your car, to stow them up high until needed again.