Piston Rings Set with Pins, standard size, cylinder bore diameter 83.00 mm.Compatible with M270.920 2.0L turbocharged inline-4 engine (1991 cc).Fits models including W176, C117, X156, W242, W246.Part numbers: A2700302017, A2700300024, A2700300417.Includes one set of pistons and one set of piston rings.Ring thicknesses: 1.2 mm, 1.0 mm, 2.0 mm.Bolt diameter: 20 mm.Bolt length: 51 mm.Standard specification—no cylinder bore expansion required.