Nut lock part # 4B-4772 used to lock the shaft nut to the clutch plate in the Power Take Off (PTO) clutch. Nut locks include features that prevent fasteners from loosening due to vibration.Attributes:• Steel nut lock• Inside Diameter: 62.5 mm (2.46 in)• Outside Diameter: 82.6 mm (3.25 in)Application:Consult your owner's manual or contact your local Cat Dealer for more information.