... 3 diameter-1.83m,2.75m,and 3.67m Together with feed truck and screw conveyor,Forper gal. Silo ... 5 common diameter-1830mm,2750mm,3670mm,4600mm,5500mm,with half-ring,1-ring,2-ring,3-ring ... steel factories.All steel plates are passivation treated,with zn-coating thickness no less than 275 gram ... ladder stair is strong and slip resistant,assembled with guard rail to ensure safety,thus more humanistic. ...