This piston ring set includes 4 pieces with a bore diameter of 82.00mm (standard size), designed for use in compatible B48 2.0T turbocharged engines (1998cc).The set matches OEM part numbers 11258657760, 11258678931, 11258618503, and 11258638450.Ring thicknesses are: first ring 1.2mm, second ring 1.5mm, third ring 2.0mm.Piston pin diameter is 22mm.Compatible with models F20, F23, F33, F55, F56, and G30, including 120i and 220i variants.