Increasing horsepower and torque is common place, but that extra power can throw your clutch into a tailspin Kit includes one heavy-duty diaphragm spring and set of carbide ball bearings Stiffer spring with harder and heavier ball bearings produce more pressure onto the clutch, helping to prevent slipping and overheating Harder and heavier ball bearings lift spring quicker and actuate faster to create more pressure at an advanced rate Pressure plates with 32-bearing pockets should use the 3/8" ball bearings Pressure plates with 42-bearing pockets should use the 5/16" ball bearings If your current ball bearing pressure plate has 32 ball bearing pockets it takes 3/8ö diameter bearings, if the pressure plate has 42 pockets it will use 5/16ö diameter bearings Instructions included. DIAPHRAGM SPRG PLT