Description:Hub for brake and differential drive group that provides oil-actuation disc-type brake mechanism to retard to stop machine, and group includes differential steer hydraulic motor mounting & bevel gear drive.Attributes:• Material: Steel• Hardened• Internal Spline Number of Teeth: 35• External Spline Number of Teeth: 88• Hole Diameter: 4 mm (0.157 in)(32X)Application:Consult your owner's manual or contact your local Cat Dealer for more information.