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:• Hardened steel clutch piston• Six external flanges provide exact OEM fit• Outside Diameter: 536 mm (21.102 in)• Inside Diameter: 438.0 mm (17.244 in)• Width: 29.50 mm (1.161 in)Application:Consult your owner's manual or contact your local Cat Dealer for more information.