A smart and sturdy solid round-bar window casement fastener for timber or aluminium windows. The bar is narrow at the knuckle joint increasing in diameter towards the end resulting in a chunky solid feel. The round bar window fastener is principally used with the matching round bar window casement stay to achieve a consistent style. It has a sleek, minimalist design, making it ideal for discreet fixings in contemporary homes and modern office blocks. Not suitable for weather stripped windows.