The SECURISTYLE Defender Egress Friction Hinge Side Hung 17mm - 400mm (16") Pair is a high-quality and durable window fitting. Its side-hung design and friction hinge make it easy to open and close windows with a secure 17mm to 400mm (16") gap. Ideal for DIY projects and home security, this product from SECURISTYLE is a reliable choice for ensuring the safety and functionality of your windows.