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This Mahle plain ring set specifies a 3.634 in. second ring with 1.0 mm thickness and .136 in. radial width, offered as a performance steel Napier plain second ring. Intended for engine rebuilds requiring this exact dimension, the ring set matches the listed size and plain ring profile for compatible pistons and cylinders where these OEM‑style replacement rings are needed.
Mahle Rings Performance Steel Napier 2nd Ring 3.634in x 1.0MM .136in RW Plain Ring Set
