Daybed Mattress Frame. Sturdy allmetal construction consisting of two heavyduty 1.5" X 3/4" rectangular steel tube outer frame. Internal mattress supports consists of 5/8" round tubes fully welded to the outer frame and center 3/4" square rails. Heavy gauge formed brackets attach the suspension deck to daybed legs. Frames are assembled together with heavyduty "U" clamps and quartertwenty bolts. A tough powder coated paint finish is applied for longlasting appearance and protection.