Hoppe Square Rosettes for Euro Profile Cylinder. 

The outside is thicker than the interior, Requires an offset cylinder.

Exterior Diameter: 2-3/16  inch (55mm)  2.165″
Exterior Thickness:  9/16 inch  (15mm)  .590″
Interior Diameter:    2 inch  (52mm) 2.04″
Interior Thickness:  3/8 inch  (10mm)  .393″
Screw Hole Spacing: 1-1/2 inch  (38mm) 1.496″
 
Fixing: Concealed screws, bolt through M5 Thread
Finish: Stainless 
Base Material: Zamak Exterior, Steel Interior

Note: Zamak is a base metal of zinc and alloying elements of aluminum, magnesium, and copper, typically used in die cast materials.