The plastic clamp brackets allow aluminum blinds with steel top rails in the dimensions 25 x 25 mm to be mounted in seconds. Simply slide the clamp onto the window sash from above and click the blind into place - the aluminum blind hangs securely. For up to 90 cm width of the blind, 2 clamp holders are sufficient. For wider aluminum blinds should be used at least 3 clamp holders, per 45 cm width should be added one more clamp holder to ensure optimum stability. 2-pack.