Pin Bolt Diameter: 24mm Pin Bolt Length: 56mm Cylinder bore: 92.9mm OEM NO.: A2780302317 Condition: Piston Ring Set for A2780302317 engine applications.This 8-piece set includes pistons and rings designed to fit models from 2011 to 2019 with X166, W166, W221, W222, GL500, S500, M278, GLS500, E500, ML500, and compatible 4.6T and 4.7T engine variants. The components are manufactured to meet specifications.The 24mm pin bolt diameter and 56mm pin bolt length proper alignment and secure installation.With a cylinder bore of 92.9mm, the set supports consistent engine under normal conditions.Ring thicknesses vary between 1.2mm, 1.5mm, and 2.0mm to accommodate standard combustion chamber dynamics. Designed for direct replacement, this piston ring set integrates into the engine assembly without modification.Compatibility should be confirmed prior to installation using vehicle-specific identification data.This set helps restore engine performance to factory-calibrated levels when installed correctly. Compatibility : This is a third-party replacement component.Brand and model references are included solely to indicate fitment.