Cylinder Bore: 77.00 mm Compression Height: 28.5 mm Land Height: 5.5 mm Length: 51.2 mm Bolt Length: 48 mm Bolt Diameter: 20 mm Recess Diameter: 34.7 mm This 4-piece engine piston and ring set is designed for compatibility with N18 B16 A C STD series engines used in Countryman and Paceman models from 2010 to 2016.Featuring a cylinder bore of 77.00 mm and a compression height of 28.5 mm, the pistons are engineered for and integration within the engine system.The land height of 5.5 mm and overall length of 51.2 mm support stable under pressure and temperature conditions typical of turbocharged applications. The set includes bolts with a diameter of 20 mm and a length of 48 mm, secure attachment to the engine block.A recess diameter of 34.7 mm allows for fitment and clearance.Constructed from materials meeting OEM specifications, the pistons are built to endure demanding engine environments.The low volatility specification indicates reduced evaporation loss, contributing to sustained engine efficiency and over time.This piston and ring set supports consistent and long-term when installed in compatible vehicles. This is not an OEM product.Brand/model references are included solely to assist with compatibility identification.