This piston ring kit includes four sets designed for 1.8T engines with a 23mm piston pin diameter.The rings are manufactured to +0.5mm oversize specifications for appropriate fitment in compatible engines.Verify your engine code and piston dimensions before installation.Compatible engine codes: CPRA, CXBA Associated part references: 06J198151E, 06H107065DL, N91176601 Specifications: - Piston diameter: 82.5mm (3.25in) - Pin diameter: Φ23mm - Ring thickness: 1st ring 1.2mm, 2nd ring 1.5mm, 3rd ring 2.0mm Package includes: - 4 piston ring sets Fits the following vehicles: - 2008–2013 A3 Cabriolet 1.8T (CDAA, CDAB, CDHA, CDHB) - 2009–2013 A3/S3/Sportback/Limousine 1.8T (CDAA, CDAB, CDHA, CDHB) - 2008–2015 A4/Avant 1.8T (CDAA, CDAB, CDHA, CDHB) - 2008–2011 A5/S5 Coupe/Sportback 1.8T (CDAA, CDAB, CDHA, CDHB) - 2010–2011 A5/S5 Cabriolet 1.8T (CDAA, CDAB, CDHA, CDHB) - 2011–2014 TT/TTS Coupe/Roadster 1.8T (CDAA, CDAB, CDHA, CDHB) - 2012–2017 CC 1.8T (CDAA, CDAB, CDHA, CDHB) - 2009–2015 [Model] Variant 1.8T (CDAA, CDAB, CDHA, CDHB)