Reverse Peep Hole Viewer / Tactical Door Veiwer The Reverse Peep-Hole product was developed with the help of the law enforcement industry to help them assess potential hazzards behind dwelling doors. The reverse peephole viewer un-distorts the convex lens that's designed for homeowners to view out, not in. The officer places it over the peep-hole in the door and can look into the dwelling without alerting anyone inside. You can Quickly assess any potential threats or activity before proceeding with your mission. Reverse Peep-Hole is made of high quality, lightweight materials. Reverse Peep-Hole Viewer fits most common peepholes used in Australia for apartments, condominiums and houses. Reverse Peep-Hole Viewer can be used in other countries where the peepholes are similar to those used here. The housing is a strong, lightweight Aluminuim with an all-weather coating.