We no longer ship the ARP version of this bolt! You'll see an ecoboost part instead. 

As the crankshaft on your NC engine flexes, the damper absorbs incredible amounts of energy, that's what it's there for. These damper bolt kits from ARP will ensure that your balancer is locked into position allowing it to absorb bad engine harmonics. They feature a 1/4 in. thick wide-area washer and an extra-tall, 12-point head that accepts a deep socket to eliminate the fear of stripping the head.