3 1/8 Inch Solid Brass Traditional Doorbell Button (Several Finishes Available)3 1 8 Inch Solid Brass Traditional Doorbell Button Measures 3 1 8 Inches by 1 3 4 Inches Uses 24 Volt Maximum (Standard Doorbell Circuits) Button Is Made From Color Matching Resin Material Center to Center distance is approximately 1. 81 Inches This doorbell mounts with two brass screws (included) and it has two lead contacts on the back. Measures 3 1 8 inches by 1 3 4 inches. Uses 24 volt maximum (standard doorbell circuits). This is available in a