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Mahle OE plain second piston ring set is listed for performance Napier steel applications with a 4.300 in bore specification and 1.0MM dimension alongside a .136 in RW marking as described. Sold as a plain ring set, it serves as a direct replacement component for engine rebuilds or ring refreshes where those sizes are required. The overview summarizes the part identity and sizing so you can confirm fitment during piston servicing.
Mahle Rings Performance Napier Steel 2nd Ring 4.300in x 1.0MM .136in RW Plain Ring Set
