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Looking to spend the least amount of time possible working on your bike? Look no further than the Park Tool HT-10 10mm Hex Tool. With an extra long and super strong 10mm hex on one end and a ball end hex on the other, this tool is specifically designed for use on cranks but will work with any thingamajig that requires a 10mm hex for adjustment.
10mm Hex On One End, Ball End Hex on the Other
Ergonomically Designed Screwdriver Grip