Palace Mailbox Replacement Lock - The 1-piece 16 mm universal mailbox lock, with 2 keys. -Cam and cam nut easy to install, can be rotated 90 degrees to open. The security cam lock comes with two keys. -16mm cylinder length, 35mm lock plate sizes to meet the needs of most cabinets. - Used to replace mailbox locks (03080625, 03080640, 03080630)