Security Boss SB Standard Wall Mount Pet DoorThe SB Standard Pet Door is Security Boss highest rated utility, economy pet door made for walls 2" to 10" thick. This aluminum framed pet door features several attributes that sets it apart from other utility or lower priced pet doors. All Security Boss products are hand built to order. Features Strongest Frame (aluminum) Weatherized Flap Prevents Yellowing & Shrinking Solid 1 4" Security Locking Panel Most Secure Wall model fits 2" to 10" thick