A2780302317 8pcs Pistons Rings Set Φ24mm For 11-19 X166 W166 W221 W222 GL500 S500 M278 GLS500 E500 ML500 4.6T 4.7T This 8-piece piston rings set is designed for compatibility with a range of engine models, including those from 2011 to 2019 with X166, W166, W221, W222, GL500, S500, M278, GLS500, E500, ML500, and 4.6T or 4.7T engine configurations.The set includes eight pistons and corresponding rings, providing a complete replacement solution for engine rebuilding. The pin bolt diameter measures 24mm with a length of 56mm, proper fitment within the engine block.The cylinder bore size is 92.9mm, aligned with standard specifications for compatible engines.Piston ring thicknesses vary across the set at 1.2mm, 1.5mm, and 2.0mm, supporting effective compression sealing and oil control under operating temperatures and pressures. Manufactured to meet specifications, the set supports low emission output and complies with environmental standards.Installation is designed to integrate into the engine assembly process.For accurate fitment, verify compatibility using the vehicle identification number prior to installation.This piston rings set helps restore engine performance to factory-level , supporting function in demanding conditions. Disclaimer: This is not an part.References to brands or models are used only to illustrate compatibility.