Single-Phase, Keyless Sliding Door Lock.

This type of lock is designed for sliding doors, which require a different locking mechanism than standard doors. The lock uses a hook that engages with the door frame to secure the door. It is often used in aluminum-framed doors and can be installed in a mortise (recessed into the edge of the door) for a cleaner look. The lock is keyless, meaning it likely operates with a thumb turn or similar mechanism on the inside.