Park Tool BBT 10.2 Adjusting Cap Tool. The adjusting cap on Shimano Hollowtech II cranks has a unique fitting which requires a special tool for service. The Part Tool BBT 10.2 Adjusting Cap Tool is designed specifically to work with Shimano's Hollowtech II cranks for removing and installing the crank caps. And not only can it perform the removalinstallation task, but the BBT 10.2 tool also features a hook designed to remove the crank arm's safety plate.
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