Check the listing for details. Modern Door Knocker with Viewer Solid Brass in 5 Variations By Deltana. Condition: New. Listed at 69.91 USD. Sign Up for our free newsletter above! Modern Door Knocker This modern viewer door knocker includes a 200 degree glass lens viewer for a less obvious way to add security to your home. Now you can safely see who is at your door before you open it. The glass viewer has a 9/16" diameter shaft and is UL Listed. This Modern Knocker is made of solid brass. It is thru-bolt mounted with 3-15/32" center to center mounting holes. Includes 2 matching finish screws with 5/8" diameter decorative screw bezels for easy installation.Material: Solid BrassHeight: 4-5/8"Width: 3"Mounting Centers: 3-15/32" CCMax Projection: 1-1/8TH"Mounting: Thru-BoltedIncludes matching finish hardware and eye viewer TAKE A LOOK AT OUR OTHER eBay STORE ITEMS. WE MAY HAVE WHAT YOU ARE LOOKING FOR…AT A GREAT PRICE! ***DoorAndWindowHardware eBay Store*** Thank you for placing your order with DoorAndWindowHardware! We do appreciate your business!