Defender Security U 10827 Blocker Entry Door Stop, 2-3/16 in L, 1-3/8 in W, Aluminum, Anodized Satin Nickel

This high security door lock is a spring-loaded reinforcement lock that protects against unauthorized entry by preventing lock bumping and lock picking while in the locked position. This lock is designed to withstand 800 lb of force and cannot be opened from the outside.