Overall Length: 513 mm Extrusion Length: 485 mm features: Adjustable friction restraining stay Surface mounted for easy fitting Suitable for use with timber, steel and aluminium windows or light doors Allows opening between 90 - 100 degrees Extruded channel can be reduced by 25 mm maximum Material: Aluminium extruded channel with steel arm and fixing plate Nylon friction block with adjustment mechanism -strong buffer spring Black ABS end caps Aluminium extrusion with plated arm SAA extrusion has zinc plated arm and grey ABS end caps