RockyMounts 9mm Clutch The same Clutch body as our other bolt ons, but simplified with an oversize, Cro-Moly 9mm skewer for a fitted closure Made from burly, non corrosive cast aluminum, with a wide footprint for a rock solid bike mount Flat base with three mounting holes for a variety of different mounting applications The roomy center opening serves as a tie down or a place for a cable lock Mounting hardware not included