http://www.youtube.com/watch?v=nMR2fDvbgrg
L.O.C.K™ Knuckle System
The technology behind the L.O.C.K.™
(Locking ‘O’ Ring Compression Knuckle) was patented with the 360HD™ Knuckle System(U.S. Patent NO. 6,161,948).
http://www.bklighting.com/products.php?ID=832
Thanks and feel free to call if you have any questions.

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