Compatible with hydraulic clutch operated models only. 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 clutch springs. - 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 2 spring sets (harder/softer) for optimal tuning - Fits under stock primary cover - Compatible with stock or high performance clutch plates - Easy bolt-on installation