Twist Hand-Turn Solid Brass Wireless Mechanical Doorbell Chime in Polished Lacquered Finish Vintage Decorative Antique Victorian Door Bell with Easy Installation Victorian Style Doorbells are the best way to annouce a guests' arrival by making a delightful and charming sound Made from solid brass. Mounts directly to the entrance door, no wiring system needed The product has a Polished Lacquered Finish Diameter: 4 1/2". Can be fitted on doors up to 1 3/4 inches thickness Includes mounting hardware such as screws