Pin Bolt Diameter: 24mm Pin Bolt Length: 56mm Cylinder bore: 92.9mm OEM NO.: A2780302317 The A2780302317 8pcs Pistons 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 equipped with 4.6T and 4.7T engines.This set includes eight pistons and corresponding rings, providing a complete replacement solution for engine rebuilds. Each component is manufactured to meet specifications.The 24mm pin bolt diameter and 56mm pin bolt length proper fitment and connection stability.With a cylinder bore size of 92.9mm, the set supports efficient combustion and consistent engine.The piston rings are produced in multiple thicknesses—1.2mm, 1.5mm, and 2.0mm—to accommodate different ring groove dimensions and sealing requirements. Designed for performance under thermal and mechanical loads, the rings contribute to reduced oil consumption and improved compression.The set supports low emission output, aligning with environmental standards.Installation is intended to be direct as part of an engine overhaul, provided correct model match is confirmed prior to use. This item is a compatible alternative.Use of brand identifiers is limited to showing which models it fits.