The Mahle OE plain ring set is a performance steel Napier second ring specified for a 3.3071-inch bore with 1.2 mm section height and .135-inch RW measurement, offered in a 48-quantity bulk pack according to the description. Intended for volume rebuilds or shop stocking, the listing emphasizes the ring's exact dimensions and Napier steel construction for precise engine application where that size is required.
Mahle Rings Perf Steel Napier 2nd Ring 3.3071in x 1.2MM .135in RW Plain Ring Set (48 Qty Bulk Pack)