Mantua U3456RG is a bed frame that can be assembled in various sizes, from twin to king. It comes with both glides and rollers, so you can choose which type of support you prefer. The rollers with locks should be placed at the four corners of the bed for added stability. The bed frame is easy to assemble, with clear instructions and all necessary parts included. It is also sturdy and durable, made from high-quality materials. Whether you are looking for a new bed frame for your guest room or your master suite, the Mantua U3456RG is a great choice.