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The Mahle OE plain second-ring set is a Napier steel 2nd piston ring sized 4.135 in × 1.0 mm with a .136 in RW profile. Sold as a standard plain ring set, it supplies the specified second-ring geometry for piston rebuilds, offering OEM-style replacement where this exact diameter and profile are required during engine overhaul or repair.
Mahle Rings Performance Napier Steel 2nd Ring 4.135in x 1.0MM .136in RW Plain Ring Set
