Yale Key for Door Security Bolt, Grey, Pack of 1

Zoro Tools

The Yale PM444 series security door bolts are concealed (mortice fixed) into the door with a bolt which throws into the door frame. Operated by using the key supplied giveing added securiy and extra protection to your home.

Amazon

Key for concealed door bolts Suitable for wooden doors Lock can only be operated from inside Additional security, ideal for back doors Recommended that two bolts are used per door, Weight: 0.14 pounds, Manufacturer: Yale