Window Resenctor Arm,friction hinge: 1.Material:304# stainless steel 2.Use of steel slider, high strength, smooth sliding. Windows' Positioning of Wind BracingAdvantage:1.Use of the the finest stainless steel:304# stainless steel.2.In line with China QB/T3888 "stainless steel sliding aluminum windows friction stay" standard.3.The use of steel slider, high strength, smooth sliding, wear and ensure ...