Update 8/19/10: Both sets are sold!
Update 8/18/10: I have 1 set left.
I have 2 sets for sale. Each set contains 2 Barri Nuts. They are used but were only installed on my lights for 2 weeks.
"Secure your auxillary lights against theft by fitting Barri Nuts to your lights. Each Barri Nut Lock Kit comes with two M10 X 1.50-threaded Barri Nuts and a special key that permits the Barri Nuts to be threaded and unthreaded. Similar to lock nuts for wheels. The Barri Nuts are individually keyed to prevent unauthorized access to your auxiliary lights."
$20.00/each set shipped anywhere in the CONUS. Paypal preferred.
(These pictures are mine, they are photos of the actual product I am selling)
(These pictures were taken from the Barrinut website.)