The side center supports on my queen size bed frame are each one and a half inch by one half inch and the 2 corner supports at foot of frame are 2 inches by one half inch. The frame is very sturdy and I have gel mattress on it which is very heavy. There is plenty of room under bed frame for boxes and bagged up comforters, etc. I am very pleased with the bed frames, as I bought one, then bought another after I saw how sturdy the first one was. Very easy to assemble too.