Park Tool HR 8 8mm Hex Wrench. An absolute must have tool for the home bicycle mechanic, the Park Tool 8mm Hex Wrench is a staple item for tighteningloosening 8mm crank arm bolts. As a bonus, one end of the hex wrench features a Bondhus ball end which enables the tool to work in hard to reach places. And of course there's renowned Park Tool quality through and through so you know it's built for the long haul.
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