A29 Twist Hand-Turn Solid Brass Wireless Mechanical Doorbell Chime in Oil Rubbed Bronze Finish Vintage Decorative Antique Victorian Door Bell with Easy Installation SUPERIOR ANTIQUE DESIGN: Victorian style Hand-Turn Twist Mechanical Doorbells chime are the best way to announce a guests arrival by making a delightful and charming sound. DIMENSIONS: Interior Doorbell: 3 3/4 X 5 3/8 ; Exterior Twist Plate: 1 5/8 X 2 7/8. Perfect for doors up to 2 1/4 thickness. The spindle can be cut to desired length to fit doors of lesser thickness. SOLID BRASS CONSTRUCTION: Made from solid brass. This decorative door bell is wireless and mounts directly to the entrance door, no wiring system needed, no batteries needed. FINISHED PRODUCT: This vintage doorbell has an Oil Rubbed Bronze Finish. EASY DIY INSTALLATION: Includes installation hardware such as high-quality screws (1 extra). For fixing screws on any wooden surface, mark and drill pilot holes with a drill bit appropriate for the mounting hardware. Insert and tighten the screw. Do not over torque the screw as it may break. The screws supplied are for wooden surfaces. For Metal surfaces other suitable screws must be used.