... :19.5mm-24mm;4.Thickness of iron pipes:0.7mm-3.0mm;5.Color:ivory,gray,beige,black,green ,red,blue ... rack system,Roller Tracks,Connectors,Caster ,Pipe accessory3.Quality:We have specialized quality control department to guarantee that all our products are qualified4 ... so the leading time can be shorten to some extent.5.Service:Customer design is highly welcomed and good professional after-sale service