KEYE 19mm Round Groove window friction stay are ranges from four-bar & five-bar stainless steel friction stays which are used for the support and frictional control of projecting side hung & awning windows. • Material: Stainless Steel 202 • Its composite stainless steel and nylon slider for strength, durability, and smooth operation • Manufactured with the selected best quality of stainless steel • Designed for standard style of side hung windows • Easily adjust the opening angle joints • Works well after overloading tests of 50000 times