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ISIS cranks have been around a long time, and they're still a great design. If you've got one, keep it in top working condition with these quality crank bolts from FSA. - ISIS-compatible - M12

This is a MegaExo Left Crank Bolt for 19mm MegaExo Cranks. - M12 bolt

This is an FSA MegaExo Crank Arm Bolt for 19mm MegaExo alloy cranks - Designed to fit alloy FSA cranks only - Includes M12 bolt, M27 self-extracting cap, and washers