ARP Pro series flywheel bolt kits from ARP allows you to upgrade your flywheel bolt to a heavier duty grade hardware. Great for higher horsepower engine that needs the extra strength. These flywheel bolts are stronger than OEM hardware, forged from aerospace alloy, and are heat-treated prior to thread rolling and machining. These bolts feature a flat 12-point head design and a larger-than-stock shank diameter for more extreme duty. This is for a full set of 8 to replace all of your flywheel bolts on your SR!