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Mahle MS piston ring set sized 4.000" +0.005" includes 1.0mm, 1.0mm and 2.0mm file-fit rings for final sizing during rebuilds. These rings are meant to be hand-filed to the correct end-gap for each cylinder bore, enabling proper sealing and oil control once installed. The description suits machine and shop work where ring matching and clearance measurement are standard procedures.
Mahle MS 4.000in +.005in 1.0mm 1.0mm 2.0mm File Fit Rings
