2-1/3" Diameter A sturdy built of the doorbell remains durable after years of use Screw Holes are 1-1/2" Apart The metallic piece has a natural lustre which does not fade easily One can clean the dust and dirt by wiping it with normal cleaner because the finish is non-reactive Solid Brass Construction A very cost-effective solution with a top-notch quality product 2-1/4" Solid Brass Round Rope Bell Button Deltana is the architectural hardware manufacturer with a proven record for exceptional service and . Deltana inventories the country's largest selection of architectural, lighting, and door hardware in several stunning finishes made from many solid, materials. 2-1/3" Diameter Screw Holes are 1-1/2" Apart Solid Brass Construction