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"