ATI PERFORMANCE BBC 7in Harmonic Damper SFI 918871E

Harmonic Balancer - Supercharged Super Damper - 7.074 in OD - SFI 18.1 - Steel - Black Oxide - Internal Balance - Big Block Chevy - Each 6 Bolt Hub The hub has 1) 3/16 Keyway and 1) 1/4 Keyway