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Mahle plain ring set in 4.130-inch diameter with a 1.2 mm cross-section is specified as a ductile iron Napier second ring with a .168 RW dimension. This ring set matches Mahle performance dimensions for applications requiring the listed diameter and section thickness. It is intended as a direct-replacement second ring option during engine rebuilds where these specifications are called out.
Mahle Rings Performance 4.130in x 1.2MM Ductile Iron Napier Second Ring .168in RW Plain Ring Set
