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. Supplied as a plain ring set, the description provides the precise dimensional profile necessary for correct replacement in engines matching that bore and ring specification, focusing on accuracy and fit.
Mahle Rings Performance Steel Napier 2nd Ring 3.3071in x 1.2MM .135in RW Plain Ring Set