Mahle Rings Steel Napier THM 4.065 x 1.5MM .151 RW Plain Ring Set (48 Qty Bulk Pack)

These Mahle OE piston rings are made from steel and feature a Napier hook design on the second ring, which helps improve oil control and reduce blow-by. The top ring is a standard 1.5mm width, and the overall bore size they're designed for is 4.065 inches. This bulk pack comes with 48 sets, making it a solid option for shops or engine builders working on multiple projects.

The Napier hook on the second ring is a well-known design choice for its ability to scrape oil off the cylinder wall more effectively than a conventional ring. This helps prevent oil from entering the combustion chamber, reducing smoke and oil consumption. The steel construction offers good durability and heat resistance, important for maintaining a good seal under operating temperatures. This set is intended for engines where precise sealing and oil management are critical.