Piston diameter: 82.5mm Pin bolt diameter: Φ21mm Ring thickness: 1.2 / 1.5 / 2.0mm Compatible with CDHA EA888 engine models in A3, A4, A5, and TT vehicles This piston and ring set is designed for 1.8T engine applications, providing performance and durability for both standard and enhanced driving demands.The kit supports a complete engine rebuild, including pistons, rings, wrist pins, and associated components such as bearing shells, oil seals, gaskets, and timing chain tensioner for full four-cylinder replacement. The piston design features an optimized structure to handle elevated operating temperatures, meeting 105℃ volatile matter specifications for improved longevity.With a precise 82.5mm piston diameter and 21mm pin bore, the components are engineered for accurate fitment in the EA888 engine platform.Multiple ring thickness options allow for tailored clearances to match specific build requirements, supporting efficient combustion and oil control. Suitable for engine overhaul projects, this set helps restore engine output and efficiency, smooth and dependable after reconstruction. This item is a third-party substitute.Use of brand names is limited to indicating which devices it supports.