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The OSO Pro Collar was the product that started the revolution from typical spring and unlock jaw collars. Dreamed, conceived, engineered, prototyped, tested, and overbuilt in Colorado, USA; the OSO Pro Collar was the first advancement in plate retention technology since caveman invented the wheel. The collar works by flexing the aluminum body around the bar and using a patent pending locking mechanism to keep the pressure on the bar. Unfortunately, there will be no rest time during your WOD due to excessive re-clamping of plates on your bar.