This Mailbox Lock by Prime-Line Products is a diecast constructed cylinder lock that comes with a brass-plated face and brass pins. This lock is designed to replace a variety of manufacturer s original equipment product and it rotates a full 90 degrees counter-clockwise to open. This mailbox lock replaces locks on mailboxes manufactured by Auth-Electric Bommer and others. This lock features a 7/8 in. outside diameter and three cams. Includes 1 lock and 2 keys.