Jims USA Polished Oil Pump Assembly for Big Twin Your choice of polished billet or OEM-style black wrinkle finished 6061 aluminum construction CNC-machined feed and return gears increase pump flow and return volume Pumps include cover, gears, drive shaft, seals, gaskets, woodruff keys, snap-rings and mounting bolts Oil pumps do not have provisions for primary chain or drive chain oiling Made in the USA