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This Mahle OE plain ring set is a Napier THM-13 plain piston ring kit specified at 4.150 inches with 1.5 mm thickness and .150 ring width. Offered as a precision replacement ring set, it is intended for engine rebuild or maintenance where the listed dimensions match cylinder and piston requirements. The listing describes the plain ring construction and nominal sizing for correct application.
Mahle Rings Performance Steel Napier THM-13 4.150 x .1.5MM .150RW Plain Ring Set
