1.Adopt Excellent PS engineering plastic with a certain quantity of anti-aging agent under injection process; ensure a strong anti-aging function with longer lifespan.
2.Special design in window door connection part offers a better sealing when close up.
3.Reset Spring and Pulley support are all made of excellent stainless steel, Lifespan is extended.
Added with special designed pull rod pulley which reduce friction and facilitate installation mostly by holding up pull rod or steel rope.