These thin square key plates (2mm) belong to the brass Dallas door handles from Hoppe in Resista finish (F78-1-R).
The Resista finish is a qualitative finish which is also suitable for outdoor use and comes with a 10-year warranty.
These brass key plates have a diameter of 52mm and are only 2mm thick. The base consists of stainless steel and is then provided with an anodized layer which is 'baked' in it. This provides a very solid color fastness, even when used outdoors.
These thin brass satin-finished key plates are supplied in pairs including rosettes and mounting materials and are suitable for door thicknesses of 35-45mm.