Mahle MS 4.005in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings

This is a Mahle MS piston ring set, sized at 4.005 inches with a file-to-fit clearance of +.005 inches. The ring dimensions are 1.0mm for the top and second rings, and 2.0mm for the oil ring. These rings are designed for engines where precise gap setting is crucial for optimal performance and sealing. File-fit rings allow you to precisely set the piston ring gap to match your specific engine build and cylinder wall condition, which is especially important for high-performance or custom engine applications.

Mahle is a well-known name in engine components, and this set reflects their focus on providing parts that meet the needs of engine builders. The construction of these rings is intended to provide a solid seal against the cylinder wall once properly gapped. Because these are file-fit rings, they require careful installation and measurement to achieve the correct gap. It's important to have the right tools and knowledge to set the gaps accurately to avoid engine damage.

Please note that this ring set is not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for proper ring gap specifications and installation procedures.