Defender Security S 4648 Mail Box Lock, 3 Cams, 5 Pin, Brass Plated, Pack of 1 Go to amazon.com Related posts The 13 best mailbox lock replacement for 2022 FeatureBrass finish3 cam assortment7/8 diameterEasy installment DescriptionThis mailbox lock is constructed from die cast and comes brass plated. It features 3 cams and a hex nut threaded cylinder. This type of lock is easy to install.