Quality 12-point heat-treated 8740 chrome moly steel bolts with black oxide finish and/or Chrome depending on your selection 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 Manufactured by ARP« to FeulingÆs« exact specifications All kits include moly assembly lubricant for installation Made in the U.S.A.. BOLT KT PRI/TRAN FX 06-16