Pin Bolt Diameter: 24mm Pin Bolt Length: 56mm Cylinder bore: 92.9mm OEM NO.: A2780302317 Condition: This 8-piece piston rings set is designed for compatibility with a range of vehicle models from 2011 to 2019, including X166, W166, W221, W222, GL500, S500, M278, GLS500, E500, ML500, and engines designated as 4.6T and 4.7T.The set includes eight pistons and corresponding rings, providing a complete replacement solution for engine rebuilding or repair.The product is built to deliver consistent performance while meeting standard emissions requirements.Installation is designed to integrate into the engine block when following standard procedures.For accurate fitment, verify compatibility using your vehicle's identification number prior to installation.This piston rings set aims to restore engine functionality to factory-level performance.Compatibility Statement: This is not an manufacturer part.Brand/model references are used for fitment guidance.