Features: The exterior lens is constructed of a scientific glass to prohibit scratching while creating a field of vision exceeding 160°. All viewers are furnished with a shutter.

Installation: Drill a 0.5" hole completely through the door; insert the lens portion into the exterior side and the slotted scope portion through the interior side. Tighten with a slotted screwdriver or a coin.

Model 0155: 0.5" diameter quality door lens. Adjustable for door thickness from 1.312" to 2.25".

Model 0156: 0.5" diameter quality door lens. Adjustable for door thickness from 2.25" to 3.25"