4 Set 1.8T 23mm Piston Ring Kit W +0.5MM 06J198151E 06H107065DL N91176601 For A3 A4 A5 TT CPRA CXBA Piston Diameter: 82.5mm (3.25in.) Pin Diameter: Φ23mm Ring Thickness: 1st 1.2mm, 2nd 1.5mm, 3rd 2.0mm Package Contents: Piston rings set x4 This piston ring kit is designed for use with 1.8T engines and fits a range of models including A3, A4, A5, TT, and CPRA/CXBA variants.The +0.5mm oversize piston diameter ensures proper fitment for bored or sleeved cylinders, while the Φ23mm wrist pin diameter matches OEM specifications for assembly. The set includes four complete piston ring sets, each with three rings of varying thickness to optimize compression sealing and oil control.The first ring is 1.2mm thick, the second 1.5mm, and the oil control ring measures 2.0mm, engineered to maintain cylinder pressure and reduce blow-by during. Note: This part is made by an independent vendor.Any brand/model mention is for compatibility purposes only.