Description:Cat balance 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 balance piston• Width: 39 mm (1.535 in)• Inside Diameter: 118 mm (4.6456 in)• Outside Diameter: 305.59 mm (12.031 in)Application:Service component of planetary transmission group. Consult your owner's manual or contact your local Cat Dealer for more information.