... 4.adjustable support adjustable support ,Stainless Steel elbow fitting, Pipe Fitting,elbows,pipe connector,we and Europe, the famous stair handrail ... 3mm / 50.8mm/60.3mm and so on.Square pipe-outside dimensions(mm): 12×12 mm--40×40mmRound flute tube ... and industry instruments(fencing,railing,safe door/windows,gate fitting,inside staircases ,balcony balustades,furniture,sanitary wares,kitchen wares ...