Feuling Rocker Box Fastener Kit For Harley 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 and preventing leaks. Features: Tensile strength rated 170,000 psi - Superior & Stronger than OEM & stronger than grade 8 fasteners Quality engine builders demand quality fasteners Secure your engine with complete confidence Manufactured by ARP to Feulings exact specifications Kits include moly assembly lubricant for installation Made in the U.s.a.