Tilton OT-Series Sintered Metallic Clutches are designed primarily for race applications. Utilizing thin sintered metallic discs, these clutches offer a low moment-of-inertia, high torque capacity in a compact size. Tilton clutch covers are unique in that they have hardened steel thrust buttons, providing a smooth and durable surface for the pressure and floater plates to slide against. These features have made sintered metallic clutches the most commonly used in racing (sintered metallic clutches are not recommended for street use). Tilton OT-Series Sintered Metallic Clutches can be found in NASCAR, Champ Car, Grand Am, ALMS, FIA, ARCA, SCCA, SCORE, and most other racing series worldwide.