Extreme Clutch Stage 1A Sprung Organic Clutch Kits are recommended for Street use in vehicles with minor engine modifications. Sprung organic clutch kits offer exceptional driveability for vehicles used daily but also have performance modifications. The sprung organic disc offers improved dampening which reduces the shock loading on the transmission. Suits: Holden V8 & Chevrolet with 153 Tooth Flywheel Specifications Flywheel Step (mm) Flat Clutch Disc Diameter (mm) 255 Clutch Disc Spline Count 10 Clutch Disc Spline Diameter (mm) 28.6 Disc Type Sprung Friction Material Organic Stage 1 Recommended Use Street Clamping Force % Increase 20% Torque (Nm) Inc FOS 450 Torque (ftlbs) Inc FOS 330 Spigot Bush/Bearing Included Yes Aligning Tool Included Yes Spline Grease Included Yes Transport Weight (kg) 10.2