This white window stop is ideal for securing windows from the inside. The Yale YALV8K103WE 8K103 PVCu Window Stop is suitable for surface fixing to PVCu windows, it has a simple push to lock action with key to release. This 8K103 window lock is supplied with a selection of packers for different window sizes. White powder coated aluminium. Suitable for surface fixing to PVCu windows. Simple push to lock action with key to release.