Compatible with FJ180V FJ180 FC180 lawn mower engines, this piston ring set is designed for use as a replacement in 65mm cylinder blocks.The kit includes oil and compression rings that help maintain proper engine performance by sealing the combustion chamber and regulating oil consumption.engineered to fit standard 65mm bore size, these rings are intended for straightforward installation during engine maintenance or rebuilds.Suitable for use in small engine applications where sealing and are required.