WEL Paddock and Mila Sidewinder Butt Door Hinge 45 Degree Angled Plate Rehau Match White Only Available. This suits double glazed doors for Upvc. It fits onto the chamfered angled edge of door sash 45 degree angle, which was often used on Upvc profiles such as Rehau, which had a more prominent chamfer than many other Upvc profiles.
eBay