EX13 Ring Set 58mm For EX13 EX13D 4.5HP 4 Stroke Engines This ring set is designed for use with EX13 and EX13D 4.5 horsepower 4-stroke engines.The set includes piston rings with a 58mm diameter, intended to fit standard cylinder bores for these engine models.It is suitable for engine maintenance and rebuilding where ring replacement is required.The components are engineered to provide consistent compression and support normal engine when installed correctly. Compatibility Disclaimer: This is an aftermarket replacement part.Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.