The product list is not clear. The 12x12 is currently available with or without a backplate, with the backplate model being the more expensive model. For my project a smaller 8" block would be the best option, I didn't even notice that option when ordering. So I have plenty of free space in mine and could save about $10. Okay. Given the built in holes I would don't use it outdoors. Although people state using it outdoors after the holes are closed. I use it indoors for an alarm panel.
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