... livestock farms.Currently 5 common diameter-1830mm,2750mm,3670mm,4583mm,with half-ring,1-ring,2-ring,3-ring and different ... domestic famous steel factories.All steel plates are passivation treated,with zn-coating thickness no less than 275 gram per square ... flow more smoothly.Safe and HumanizedSilo ladder stair is strong and slip resistant,assembled with guard rail to ensure safety,thus more humanistic ...