178F +0.5mm piston ring pin kit for single cylinder air-cooled diesel engine.Includes components for engine enlargement by 0.25 mm and 0.5 mm.Designed for use with 178F+0.25 and 178F+0.5 models.Kit contains piston rings and wrist pins suitable for repair and overhaul of diesel engines.Compatible with standard 178F engine configurations. Disclaimer: This is not an part.References to brands or models are used only to illustrate compatibility.