58mm Piston Ring Clips Pin Set For Fits EX13 EX13D 4.5HP 4-Stroke Engines This piston ring clip and pin set is designed for use with 58mm bore engines.It includes components compatible with EX13 and EX13D 4.5 horsepower 4-stroke engine models.The set contains piston ring clips and retaining pins that are used during engine assembly or repair.These parts assist in securing the piston rings within the piston grooves to proper function during.This set is intended for use in small engine maintenance and replacement applications.