The UL 180 Degree Door Viewer is a security device designed for installation on doors to provide a wide-angle view of the exterior. This door viewer features a 180-degree viewing angle, allowing for a broad field of vision. It is constructed with a 1-1/16" lens diameter and is designed to fit a 9/16" hole. The viewer is adjustable to accommodate door thicknesses ranging from 1" to 1-2/3". The finish is bright chrome, providing a clean aesthetic for residential or commercial door applications. This product includes a limited 1-year manufacturer warranty and a limited 5-year finish warranty. The door viewer is intended for use in residential and commercial settings to monitor entry points. It is installed by drilling a 9/16" hole through the door, then inserting the viewer and tightening it to the required thickness. The bright chrome finish is applied to the exterior lens housing, ensuring it matches other door hardware. This device is a standard component for door security, allowing users to see visitors before opening the door. The construction is designed for standard door thicknesses, and the adjustable barrel allows for a precise fit on various door types. The viewer is a non-hazardous material component.