Hi-Lok® Double-Ended Roller Ratchets® from MRO Tools. Double-Ended Roller Ratchets® from MRO Tools eliminates the need for a reversible spindle, reducing the occurrence foreign objects debris (FOD), and increasing efficiency.Roller Ratchets® were developed in response to the need for very small ratchet wrenches that could be used in extremely tight spaces where handle ‘swing’ was limited by obstructions, and the need to have a ratchet that would engage with very little handle movement.Roller Ratchets® is a registered trademark of Omega Technologies, Inc. For even more Hi-Lok® Installation Tools please download and consult our print catalog.