Mahle OE plain top ring set specified for a 4.0000 bore is described as a plain top ring set intended for piston ring replacement where that exact bore size is required. The plain top construction matches the description and is supplied for professional or shop use when OE-series plain rings are specified. These rings are presented as the Claimer Series plain top ring set for compatible applications.
Mahle Rings 4.0000 Bore Dia Claimer Series Ring Set Plain Top Ring Plain Ring Set