Uses 2 hex wrenches to tighten or loosen bolt/nut Includes (5) 5mm-broach bolts, (5) 6mm-broach nuts, and (5) inner bolts: available in either steel or aluminum (8.5mm) For 4-arm and 5-arm cranks, Road and Mountain Triple Alloy material: alloy-outer/steel-
        
    
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