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The Mahle OE plain piston ring set uses gas-nitrided steel and is specified at 4.070 x .043, .157 RW to provide accurate piston sealing in rebuilds and replacements. Sold as a plain ring set matched to the listed dimensions, it is intended for installations requiring the stated diameter and running width to restore compression and proper piston-to-cylinder contact.
Mahle Rings Performance Gas Nitride Steel 4.070 x .043 .157 RW Plain Ring Set
