RACEORLY Piston Ring set with 0.25mm oversize designation for cylinder bore diameter of Φ84.25mm.Includes rings with thicknesses of 1.2mm, 1.5mm, and 2.0mm.Designed for use with wrist pin diameter of Φ20mm.Compatible with 2.0L naturally aspirated inline-4 engines with displacement of 1995cc, specifically the N46 engine.Fits models including E46, E81, E82, E83, E84, E85, E87, E88, E90, E91, E92, E93, E60, and E61.Compatible with 116i (2004–2011), 118i (2004–2013), 120i (2004–2013), 316i (2000–2006 and 2005–2011), 316Ci (2000–2005), 316ti (2000–2005), 318i (2000–2006 and 2005–2011), 318Ci (2000–2007), 318ti (2000–2005), 320i (2005–2013), 520i (2006–2009), X1 sDrive18i (2009–2015), X3 2.0i / sDrive20i (2005–2010), and Z4 2.0i (2004–2009).Compatible with engine codes N46, N45, N42, and N40.OE part numbers referenced: 11257562457, 11257556435, 11257558141.Set includes four piston rings for a four-cylinder engine.