Description:Cat clutch pistons are a key component in the planetary assemblies that power tough Cat transmissions to convert engine power into the exact combination of speed and force required by individual machines.Attributes:• Cast iron clutch piston• Outside Diameter: 520.04 mm (20.474 in)• Inside Diameter: 441.52 mm (17.382 in)• Width: 24.54 mm (0.966 in)• Thread Size: 3/8-16 (2 Places)Application:Consult your owner's manual or contact your local Cat Dealer for more information.