All of the mechanical parts function as they should. It has a good sounding ring once mounted. Please look over the photo's and ask questions if needed. 2 1/8" depth, would work on a door up to 1 3/4 " thick max.Without modification to length of shaft. The item "Antique Cast Iron Brass Twist Turn knob Door Bell Pat. 1891 Vtg Ringer 172-20J" is in sale since Wednesday, April 15, 2020. This item is in the category "Antiques\Architectural & Garden\Hardware\Door Bells & Knockers". The seller is "nysalvage" and is located in Oneonta, New York. This item can be shipped to United States.