Feuling Exhaust Stud Kit For Harley Evo, Twin Cam, Sportster Features: Quality 12-point heat-treated 8740 chrome moly steel bolts with black oxide finish Feature precision rolled threads for optimum engagement, to prevent galling and promote more consistent torque loading Wide underhead flange design provides even load distribution for optimum sealing of surfaces - preventing leaks Tensile strength rated 170,000 psi - Superior and Stronger than OEM and stronger than grade 8 fasteners Kit includes moly assembly lubricant for installation Made in the USA