Kit includes a steel clutch hub; steel & friction clutch plates combined with an adjustable lock-up one-piece billet aluminum pressure plate. It has 3 pressure arms; the more RPM the harder the clutch bites. Works with 3 coil style springs. Greatly increases clutch capacity. Provides smoother shifting and offers multiple spring pressure options. Ideal for stock to highly modified applications. Includes steel hub; billet pressure plate; clutch plates and 3 different coil springs sets (light; medium; heavy). - Progressive pressure as RPM’s increase; right there where it counts - One-piece; no-flex billet aluminum pressure plate - Hard anodized for optimal durability - With 3 spring sets (light; medium; heavy) for optimal tuning - Fits under stock primary cover - Complete with clutch plates; steel steel drive plates and high performance friction plates - Easy bolt-in installation Note: Derby cover spacer MCS 939319 is required. The spacer plate is NOT required when using the Barnett derby cover 923387 (chrome); 923383 (black).