On-metal Manhole Cover Plastic RFID Tag use PA66 material which is a kind of engineering Material which is Corrosion resistance, no lead, no rust, no oil, easy to clean, easy to maintain! it can work well under high temperature and terriable climate.
UHF Metal Bolt Tag is for manhole cover tracking use 304 steel material which is a kind of HQ special materials, which is Corrosion resistance, no lead, no rust, no oil, easy to clean, easy to maintain!