Doorbell Finishes Antique Brass · Gives a quiet, aged look to the doorbell. Color variation and mottling in the finish are normal and add character and beauty to any doorbell. Oil Rubbed Bronze · A darkened finish designed to emulate aged bronze. This finish varies from a rich chocolate brown to a dark black. Doorbells 1608 and 1611 are our only doorbells available in Antique Copper as well as Oil Rubbed Bronze. Our doorbells have a finish that will accept the gradual ageing and weathering of the outdoor elements. Doorbell Installation Tools Required · 3/4" (20mm) drill bit, drill and screwdriver. Installation · Drill 3/4" (20mm) hole approximately 1" deep. · Attach one wire to each screw terminal. · Use the screws provided to mount the door bell in place. Please Note: These push buttons are for use on low-voltage doorbell systems that do not exceed 16 volts. Doorbell Chime · Click here to hear a sample of what our doorbells sound like.