Turn the empty space under your bed into prime storage with the Selby 60"Bed Storage Gas Piston Lift Mechanism. Build a platform, install the mechanism and be ready to get that clutter out of sight. Features: Install in an existing base or pedestal Can be used for end or side opening platform No box springs or foundation necessary Set of 2 Specifications: Compatibility:For use with 6"-10" thick innerspring mattress; no box springs or foundation necessary Mechanism Length: 60" Weight Capacity (mattress and platform top): 231 lb What's Included: (2) Selby -Bed Storage Gas Piston Lift Mechanisms Notes: The capacity being referenced is the target weight to be lifted. The weight should not be exceeded, but mechanism should be chosen by the weight closest to the capacity. A significant departure from the stated target capacity will cause the load to be harder to lift or harder to close.