Usually they are fitted in pairs, mainly used for bottom hung casement windows, supporting the casement as it falls inwards Keep your casement windows in a restricted open position or securely fastened with our range of casement stays and fasteners Product Description QUADRANT ARM CASEMENT STAY Safety Warning Always follow the installation instructions provided. STAY PEG SOLID BRASS 150MM-C – Price Hardware Window Safety Fitting Carlisle Brass Casement Fastener | More Handles Quadrant Arm Window Stay Includes window fitting & fixings Brass Antique Window Fittings The Quadrant arm window stay is generally used to restrict the opening of bottom hung fan light or casement windows , Solid brass construction Do not force the window open beyond the restricted distance to avoid damage or injury.