frame: we have Aluminum frame, Stainless steel frame and iron frame for our products. aluminum frame is most used, light weight, sturdy structure, powder coated and never get rusty, normal specification is as follow: Circle aluminum: dia 16mm, 19mm, 22mm, 25mm, 28mm. Square aluminum: dia 50*50, 40*40, 25*25, 20*20, 30*19, 15*15mm
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