Mahle Rings Performance Napier Steel 2nd Ring 4.205in x 1.0MM .136in RW Plain Ring Set

This Mahle OE 2nd ring is made from steel and features a Napier hook design, which helps it seal better against the cylinder wall, especially under pressure. It measures 4.205 inches in bore size with a 1.0mm thickness and a .136 inch ring groove width. This design is a solid option for performance builds where consistent sealing is critical.

The Napier hook shape allows the ring to rotate slightly in its groove, helping to maintain a good seal even as the piston rocks. This particular ring is a plain ring, meaning it doesn't have any special coatings or treatments beyond its base material, keeping things straightforward for your engine build. It's designed to work as part of a complete piston ring set to ensure proper compression and oil control.