This type of lock, also known as a cam lock, is designed to provide security for various items. Purpose: Security: The primary purpose is to secure the contents of a mailbox, cabinet, drawer, or locker from unauthorized access. Replacement: It is often used as a replacement lock for existing mailboxes or furniture. Versatility: The locks are widely used for a variety of applications beyond mailboxes, including filing cabinets, toolboxes, and other security equipment.