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All fort knox mailboxes except for the m1-lt mailbox are 1/4″ steel.  We believe 1/4″ steel is the way to go to defend your mail.  Sometimes that isn’t needed in certain situations. 1/8″ steel is still thicker than anything you can get at a hardware store.  With the design of the mailbox, it will certainly keep your mail safe from most attempts of break-ins.