Before Hollowtech and it's friends, cranks were secured using 8mm bolts and the best way to get these on or off is using a Park HR8C - 8 mm hex wrench for crank bolts.
Park 8 mm Hex Wrench for Crank Bolts
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RRP £6.99
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Before Hollowtech and it's friends, cranks were secured using 8mm bolts and the best way to get these on or off is using a Park HR8C - 8 mm hex wrench for crank bolts.