The John Deere RE521814 Piston Ring Kit is a genuine OEM component designed for optimal performance and durability in John Deere engines and machinery. This kit ensures proper piston sealing, critical for maintaining engine compression and efficiency. It is compatible with a wide range of John Deere equipment, including 6068, 6081, 6090, 6125, and 6135 engines, as well as numerous tractor, combine, cotton picker, forage harvester, sprayer, grader, loader, excavator, dump truck, dozer, skidder, forwarder, feller buncher, harvester, windrower, and backhoe loader models. Measuring 95 mm in length, 95 mm in width, and 51 mm in height, with a weight of 0.12 kg, this kit provides the necessary rings for piston overhaul or maintenance.