Our 12 Point Flexplate to crank bolt kits are the strongest bolts you can get to attach an 8 bolt HEMI crank, with 1/2" -20 (fine thread) bolts to your flexplate for high horsepower and/or highly stressed Auto trans. applications. The bolts are fully heat treated prior to thread rolling and machining. Flat 12pt head design ensures no clearance problems during installation. If you have a stroker and/or HEMI engine with aftermarket components, high stall converter, etc... these are must have item. You simply can not put in stronger bolts than these.