Mahle Rings Performance Steel Napier THM-13 4.075 x .043 .135 RW Plain Ring Set (48 Qty Bulk Pack)

Mahle OE is known for making solid engine components, and these performance steel Napier piston rings are a great example of that. If you're rebuilding an engine, especially one where you need a lot of sets on hand for multiple projects or a large shop, this bulk pack of 48 rings is a smart way to go. These rings feature a Napier hook design on the second ring, which helps with oil control and blow-by, especially in higher-performance applications. They're made from steel, offering good durability for demanding use.

The specific dimensions here are 4.075 inches for the bore size, with a ring thickness of .043 inches for the top ring and .135 inches for the oil ring. The 'RW' in the part designation typically refers to the ring groove width, and the 'Plain' indicates the finish. These are well-built rings designed to seal effectively and handle the pressures and temperatures found in performance engines. Having 48 sets means you're ready for multiple builds without needing to reorder.