The Kubota 1264321100 is a genuine OEM piston ring set, specifically designed as an oversize (+0.25mm) replacement for select Kubota engines. This high-quality set includes all necessary rings for one piston, crafted to meet Kubota's stringent specifications for durability and performance. It is crucial for maintaining proper compression and oil control within the engine, contributing to efficient operation and longevity. Always verify fitment with your specific engine model.