1-3/8" To 2-1/8" Satin Nickel Door Viewer. This Viewer Provide Security By Allowing A User To Identify Visitors Before Opening a Locked Door. Viewer Fully Adjustable To Fit Doors Thickness From 1-3/8" To 2" . Offers 220 Degrees Lens Angle For Wide Viewing. Easy to install with 9/16 inch Diamater Hole.