1.Using 6063 Aluminium frame.
2.Using stainless steelscrews.FM-CFFusingstainless steel cover.FM-CYFusing nylon cover.
3.FM-CFFusing silicone sealing strips to coverthe inside part, reduce thefriction when it drop down and reboundback, and then reduce the noise.
4.Using round copper bolt
5.Length:Can do 350mm-1500mm
6.Thefireproof sealing strips on theframe. it is suit for fireproof door.
7.Normal length:800mm,915mmand 1000mm
8.800mm can be cutted to 700mm
