floor spring
1. main body material: wrought iron
2.plaque made of 304# stainless steel
* Inside pressure reducing valve to prevent the destrution on occasion that the door closed by strong pressure or wind force *General design, suitable for left and right hand to open the door in single and both sides. *Use low temperature frostbite hydraulic oil,ensuring the normal door-closing speed when the temperature is forty degree below zero *Adjustable length in cement container is 6mm,+/-2 degree adjustable in vertical and horizontal direction at the position of 0 degree.
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304# stainless steel cover plate