Mahle Rings Steel Napier THM 4.065in x 1.5MM .151 RW Plain Ring Set

This is a set of Mahle OE Steel Napier piston rings, part number 3021209. These rings are designed for a 4.065 inch bore and feature a 1.5mm top ring thickness with a 0.151 inch ring groove width. The Napier hook design on the top ring helps improve oil control and reduce blow-by, especially in demanding applications. They are made from steel for durability.

Mahle is a well-known name in engine components, and these rings are built to meet OE specifications. The steel construction offers good wear resistance, and the Napier hook design is a functional feature that helps ensure proper sealing between the piston and cylinder wall. This can lead to improved engine performance and longevity when installed correctly.