This project will involve installing a new lock on a mailbox. The new lock will provide added security and peace of mind for the mailbox owner. The installation will require the use of basic tools and the appropriate hardware for the specific mailbox. After installation, the lock should be tested to ensure it is
From Wikipedia
An arrow lock is a lock with standard dimensions used by the United States Postal Service for mail carriers to access collection boxes, outdoor parcel lockers, cluster box units, and apartment mailbox panels. Arrow locks are unlocked through the use of a corresponding arrow key. Arrow locks are also referred to as Master Access Locks.