The Double Sided M210 Keyless Deadbolt lock is part of the wave of innovation in home security. This lock features a vandal-protected, rust-resistant, combination keypad, and only permits access to those who know its code. For use on doors requiring top-bolt locking, the M210 Keyless Deadbolt Lock retrofits to your common, everyday deadbolt. As strong as any lock in its class, this keyless lock with deadbolt adds value to your property. The M210 is suited for light traffic residential and small office entry doors where you want to control access for a relatively few number of people.