attachment to the lock 38 so that the padlock 38 cannot be removed from the first part 44 of the security bar when a tenant wishes to get his mail in the mail box 10 shown in fig1 he unlocks padlock 38 and removes the shackle 40 from the slotted staple 32 in hasp 30 and the hasp slot 36 in the end of the security bar 22 then he pivots the security bar 22 as shown in fig3 to expose the individual locks 24 in the private mail boxes 14 when a tenant wishes to retrieve his mail from a larger gang mail box where the security bar is formed in two sections 42 and 44 as shown in fig4 and 6 he first removes the padlock 38 then he retracts the slide bar 72 from the openings 70 and 68 in arms 64 and 66 of the channel shaped member enabling the bar members 42 and 44 to swing downward on pivots 50 and 52 as shown in fig4 and 6 thus exposing the individual mail box locks 24 permitting each tenant to open his mail box 14 a review of the embodiment of the locking means shown in fig4 shows that the end of the bar part 44 has to be bent to form a flange 47 and the l shaped flange 49 has to be welded to the facing surface 53 of bar.