Platform Bed Frame Mattress Foundation No Box Spring Needed (Twin). This Pilasters Designs platform bed frame supports your mattress and prevents sagging. The great thing is, that you don’t need to purchase box springs, as it supports your mattress beautifully. It has a beautiful black finish, so it can easily match to anything you put it near. Stay comfortable throughout the night with this frame support system platform bed. The king-size frame is the perfect solution for your heavy-duty bedding needs. Key Features: Features a platform bed frameFinish: BlackMaterial: MetalDimensions: 39.5” W 75 ”D 14” HWeight capacity: 350 lbs. It is 14″ H, which allows it to provide great underbed storage and makes cleaning easySimple assembly required.