Product: Picture Mirror Hanging Round Glass Plate Brass Plated Slotted 50mm Pack 20 | ToolSmart Condition: New Weight (kg/g): 0.432 Additional Information: Slotted hole is inverted, so that you can fix this plate in pairs to the top inside edge of the frame, pointing down. Two matching round head screws into the wall will slot into the keyholes, providing a hidden fixing. Works best if the backing of the pic • • • • •.