タイトルまたは説明

****0 degree operating floor spring: 1. Between ****0 degree operate, suitalbe for double door needed to open wider, or singel door open to **0 degree. 2.Hold points are *0 and **0 degree. Door can stop at any points from **- **5 degree, more vancacy possibly . 3.Adjusting valves of two secion speed control can regulate door's closing speed, ****5 degree and ***0 degree . 4.Passed **0, **0 opening times' test.