Universal Ball Jointed Monitor Mount | Mill Supply, Inc.
Surface mounting plate Type:Surface mounting plate for ball joint Material:Steel
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Articulated Ball and Socket Mounts
Buy Universal Wall / Ceiling Steel Speaker Mount Brackets with Ball-Joint (1 Pair, Black) Online for $69.99CAD at AVGearShop.com
THB Bury Ball Joint Mounting Bracket | Chameleon Direct
4-Point Ball Joint Mounting Bracket | Dancop International GmbH
Adjustable Speaker Wall Bracket - Ball Joint Mount