Security Boss SB Standard Lockable Patio Pet Door InsertDescription Security Boss SB Standard Lockable Patio Pet Door Insert The SB Standard Patio Pet Door by Security Boss Manufacturing LLC has the functionality as well as the aesthetic appeal that can not be found in other utility inserts. 4 separate height ranges will ensure this insert can fit any patio door height. Has a lockable adjustable spring loaded top that may be compressed from the outside, stopping potential intruders from doing so and