Description:Sun Gear for use with swing drive group that provides gear reduction between swing motor and swing gear, and method of holding upper portion of machine stationery in respect to lower portion of machine.Attributes:• Material: Steel• Outside Diameter: 41 mm (1.614 in)• Length: 63.5 mm (2.500 in)Application:Consult your owner's manual or contact your local Cat Dealer for more information.