6pcs Pistons & Rings Set compatible with M272 E25 2.5L V6 and M272 E30 3.0L V6 engines.Includes part numbers A2720304017, A2720301018, 2720300117, and 2720303717.Designed for cylinder bore diameter Φ88mm.Bolt diameter Φ22mm, bolt length 48mm.Ring thicknesses: 1.5mm, 1.8mm, and 2.5mm.Fits models including E-Class W211 and W212, C-Class W203 and W204, CLK-Class A209, CLS-Class C219, GLK-Class X204, ML-Class W164, R-Class V251, W221, SL-Class R230, and SLK-Class R171 equipped with M272 E25 or M272 E30 engines.Restores engine specifications and fitment. Compatibility Disclaimer: This is not an OEM item.Mentioned brands/models are used strictly for fitment illustration.