Brand: Advanced Clutch Technology Manufacturer's Part Number: GM13-HDSS Part Type: Clutch Kits Product Line: ACT Heavy-Duty Clutch Kits Automotive Fittings Part Number: ACL-GM13-HDSS UPC: 842385017668 Clutch Usage: Performance Clutch Disc Quantity: 1 Flywheel Included: No Input Spline Quantity: 26 Input Shaft Diameter: 1.125 in. Disc Diameter (in.): 11.000 in. Disc Diameter (mm): 280mm Disc Material: Organic Disc Style: Full face Hub Style: Sprung Pressure Plate Style: Diaphragm Throwout Bearing Included: Yes Throwout Bearing Style: Standard Alignment Tool Included: Yes Pilot Bushing Included: Yes Pilot Bushing Material: Steel Counterweight Assist: No Mounting Hardware Included: Yes Quantity: Sold as a kit. Description: ACT heavy-duty clutch kits offer a clamp load increase of 20 to 50 percent over OEM, significantly increasing torque capacity. The pedal feel with these clutches varies from stock to a moderate increase. Available for street and race applications, many are SFI-certified to ensure safety.