The Mahle plain second-ring set is a Napier steel 2nd piston ring sized 4.055 in with 1.0 mm thickness and .136 in RW, supplied as a 48-piece bulk pack. Intended for engine rebuild and machine-shop use, these plain rings restore the second-ring sealing surface and oil control where exact dimension matching is required during reassembly.
Mahle Rings Perf Napier Steel 2nd Ring 4.055in x 1.0MM .136in RW Pack Ring Set (48 Qty Bulk Pack)