1-5/8″ kits include front pulley, belt, clutch hub, clutch basket and aramid clutch set (consists of two half plates, four full plates and five steel drive plates). Direct bolt-in applications. All systems come with the Quiet Clutch and ball-bearing lockup design pressure plate. Lockup design applies extra pressure to the clutch plates for positive engagement with no clutch slippage. No increase in lever pull effort. Rear pulley has a 40mm, double-row bearing with an inner stress-proof steel clutch hub to support the clutch. Replacement components available separately. Made in the U.S.A.. Not for use with offset primaries.