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This Mahle plain ring set (Performance Napier THM-13) is sized 4.155 x .043 with .135-inch RW dimensions and is supplied as a bulk pack of 48 sets for piston ring replacement. Intended for engine overhaul or stocking needs where this ring dimension is required, the bulk packaging provides multiple plain-ring sets to support repeated rebuilds or volume repair work.
Mahle Rings Performance Napier THM-13 4.155 x .043 .135in RW Plain Ring Set (48 Qty Bulk Pack)
