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The Mahle plain second-ring set is a Napier steel 2nd piston ring sized 4.045 in x 1.0 mm with .136 in RW. Supplied for engine rebuilds and bulk shop use, these plain rings restore the second-ring sealing surface and oil-control role in reassembled engines where exact dimension match is required for correct operation and longevity.
Mahle Rings Performance Napier Steel 2nd Ring 4.045in x 1.0MM .136in RW Plain Ring Set
