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Description:Cat back-up rings are thin rings that are designed to prevent extrusion of o-rings, lip seals, and reciprocating shaft seals under pressure.Attributes:• 20.5° angle cut• Inside diameter: 5.94 mm• Thickness: 1.35 mmApplication:Used as needed to service hydraulic cylinder components. Available for small repair shops or field service vehicles. Consult your owner's manual or contact your local Cat Dealer for more information.