6PCS Size 85.5mm Piston Ring Set This piston ring set includes six rings with a diameter of 85.5mm, designed for use in internal combustion engines.The set consists of compression rings, second compression rings, and oil control rings.These rings are engineered to seal the combustion chamber, improve heat transfer from the piston to the cylinder wall, and regulate oil consumption.The design allows for effective gas sealing and reduced friction during engine.Suitable for certain engine rebuilds and replacements where a 85.5mm ring size is required.