Actually that is not the same bracket that is included with the 9166i or the MR57. Both of those models ship with the only bracket that matters, the AIR-AP-Bracket-2 aka the Universal bracket. The AP Bracket 1 is a waste of sheet metal as it cannot be affixed to any electrical box of any type. If you are using a third party mount you will most likely just end of pitching the AP bracket 1 into the trash where it belongs, as the lions share of these from Hubbell/Acceltex/VenTev etc dont use bracket 1's, they use the standoff "feet" keyholes https://documentation.meraki.com/MR/MR_Overview_and_Specifications/CW9166_Datasheet https://www.cisco.com/c/dam/en/us/td/docs/wireless/flyers/APbracketsAndClips.pdf Old doc bu rock solid details
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