Mahle Rings Perf Steel Napier THM-13 4.145in x .1.5MM .150RW Bulk Plain Ring Set (48 Qty Bulk Pack)

If you're rebuilding an engine and need a reliable set of piston rings for multiple builds or a performance application, this bulk pack from Mahle OE is a solid option. These steel Napier rings are designed for a 4.145-inch bore, offering a robust seal to keep combustion pressure where it belongs and oil down where it needs to be. The Napier hook design on the top ring helps it rotate and scrape oil more effectively, which is especially beneficial in engines that see a lot of use or higher operating temperatures.

Mahle is a well-known name in engine components, and these rings are built to perform. The steel construction offers good durability, and the specific dimensions – 1.5mm for the top ring, 1.5mm for the second ring, and a 3mm oil ring – are common in many performance and heavy-duty applications. Having 48 rings in this bulk pack means you'll have plenty on hand for several engine rebuilds, making it a cost-effective choice for shops or serious DIYers working on multiple projects.