1. It is designed for one-way passage. It does not allow passage to the opposite side. 2. It can be manufactured from stainless chrome-nickel steel or st 37 steel with electro-static powder paint. 3. 40*40*4mm . profile or 50 mm. diameter pipe manufacturing options are available. 4. In case of emergency, it can allow entry to the opposite direction with the key. 5. Upper and lower shaft are double ball bearing vertical bearing. It certainly does not make noise and locking. It can be used outdoors for many years. 6. Assembly and disassembly are quite easy. It can be easily dismantled and shipped to another point.