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TCI TH350 Iron Drum/ HD Sprag Assembly Tools & Pit Equipment The Kind of Innovation TopTH350 36 Element Sprag and Drum Assembly.. This 36 Element Sprag and Drum Assembly for TH350 is designed with superior material to handle higher horsepower applications. Sprags are a one way clutch device used to transfer power through the transmission. TCI heavy duty sprags are stronger than stock in both material and design. And in applications where multiple sprag designs are available, TCI always selects the strongest ones for use in our