King hybrid waterbed frame. This extra heavy duty frame includes has 9 three inch wide one piece nylon guides for the floor. The side rails and cross arms are 1 1/2 inch x 1 1/2 inch high carbon steel angle iron for strength. For bolt on headboards only. This frame can also be used by someone who wants a no wheel, heavy duty, quiet hold the weight frame. Of course this frame works with split box springs.