5 3/8 Inch Eastlake Mechanical Doorbell (Oil Rubbed Bronze Finish): measures 5 3/8 inches tall with 4 inch mount spacing. Comes with the solid brass bell, steel gear mechanism, external TURN mechanism and mounting hardware. Says "Turn" on the exterior knob - easy to identify and use. This item is made from solid brass construction. These are made for doors up to a thickness of 1 3/4 inches (thinner doors may require you to trim the connecting rod).