This is a simple-to-install MantelMount add-on accessory which allows you to integrate seamlessly into a custom-built wall opening. Easily fitting between standard or custom stud configurations, The RB100 Recess Box provides a super flush TV-to-wall storage by allowing the MantelMount center arm to now fold into the wall when the TV is in the raised position. The result is concealed mounting hardware and a 1.8 inch flush-to-wall TV storage!(For Mount Models MM700, MM540 and MM340 ONLY). Please refer to this document for mounting requirements when using the RB100 Recess Box. NOTE: If recessing the MM340 or MM540 with the RB100 Recess Box, you will also need to purchase the SSB40 Adapter to have the necessary bolt pattern configuration. The MM700 integrates directly with the RB100 and does not need the SSB40 adapter.  NOTE: The MM750 Pro Mount includes an attached recess box and does not require any accessories for recessed flush mounting.