This 8-piece piston ring set is designed for standard bore M156 6.2L and 6.3L V8 naturally aspirated engines.It is compatible with select vehicle models including C63 (2007–2015, W204/C204), E63 (2006–2011, W211), SL63 (2008–2012, R230), CL63 (2008–2011, C216), CLS63 (2007–2011, C219), and ML63 (2006–2011, W164).Specifications: - Cylinder bore: 102.25mm (standard) - Ring thickness: – 1.2mm, Second – 1.75mm, Oil ring – 2.0mm Features: - Constructed from steel for performance under pressure and temperature - Designed as a direct replacement for engines associated with OEM reference numbers 1560300017, 1560300217, 1560300517, 1560300717, and 1560300917 - Engineered for proper fit and function within the engine assembly Package Includes: - 8 piston rings (complete set for one engine) Note: Professional installation recommended.verify fitment with your specific vehicle and engine configuration before purchase.