Windoor Friction Stay: 1.Material:304# stainless steel 2.Use of steel slider, high strength, smooth sliding. Windows' Limit Wind BracingAdvantage1.Use of the the finest stainless steel:304# stainless steel.2.In line with China QB/T3888 "stainless steel sliding aluminum windows friction stay" standard3.Use of steel slider, high strength, smooth sliding, wear and ensure long-lasting durability4.Can ...