Molded of 1/8" thick, heavy-duty polycarbonateOffer excellent protection against tampering, abuse and accidental damage without affecting operation of thermostat or sensorHoles in the frame allow air to circulate freelyInner wall prevents tampering with dials and leversAll thermostat covers have a key lock assemblyEasy and quick installationAvailable for flush and surface mount applications (with use of spacer)Spacer adds 2" in depth and can mount around existing conduitThick polycarbonate cover is backed by a lifetime guarantee against damage in normal usePolycarbonate rated -40°F (-40°C) to 120°F (49°C)Thermostat Protector, Small