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The diameter of the installation holes in our mailbox's back plate is 6mm.
The diameter of the bolt is 6mm. And the bolt go through the holes on the back plate.
The diameter of the nut is 8mm. The nut would be screwed into the bolt,
and then go throught the stone's hole in diameter of 8mm.
The distance between the nut's top to the first ring should be 30mm long. OEM is also welcome. Just send us your designs , we will develot the custom molds for your new products. WThe mailbox come in size from 300L*152W *350H(mm)