This piston and ring set is compatible with B38A15 1.5T (1499cc) turbocharged engines.It includes three pistons with matching rings and is designed to fit vehicles equipped with the B38 engine, including models such as the 116i, 118i, 216i Tourer, 218i Tourer, 218i, 318i, 418i, X1 18i, X2 18i, One, Clubman One, and Countryman One.The set corresponds to OEM part numbers 11258657760, 11258693017, and 11257561710.Specifications include cylinder bore Φ82.00 mm (STD), compression ratio 11:1, piston pin diameter Φ22 mm, and ring thicknesses of 1.2 mm (first ring), 1.5 mm (second ring), and 2.0 mm (oil ring).It is intended for replacement use to restore function and fitment.