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The Chief MAC-501B is an "in-wall" accessory for swing arm mounts. The MAC-501 recesses the low profile JWD swing arm mounts in the wall, making them almost flush (1/2" depth) with the wall in the closed position.
A solid steel "in-wall" box provides secure installation.
This accessory allows the swing arm to hide in the wall or extend up to 20".
This mount is an upgrade from the MAC500, it now includes a RACO style junction box and is compatible with the JWDIW.
In the Box
Chief MAC501B In Wall Mount Accessory for Swing Arm Mounts(Black)