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The next time you change out your flywheel don't forget new flywheel hardware! All Pro Series flywheel bolt kits feature an exclusive flat 12 point head design and a larger than stock underhead radius for increased strength. You get ARP quality and a little extra insurance! Each bolt is centerless groundThe next time you change out your flywheel don't forget new flywheel hardware! All Pro Series flywheel bolt kits feature an exclusive flat 12 point head design and a larger than stock underhead radius for increased strength. You get ARP quality and a little extra insurance! Each bolt is centerless ground to ensure the bearing surface is perpendicular to the threads creating equal load distribution and are nominally rated at 200,000 psi. to ensure the bearing surface is perpendicular to the threads creating equal load distribution and are nominally rated at 200,000 psi.