10 pcs Forged Pistons with pins and rings IQ-beam Rifle Drilled Forged Connecting Rods Contains: Piston x 10 Piston pin x 10 Pin lock x 20 Piston ring x 10 Tolerances:0.001 mm for pin hole 0.005 mm for diameter Clearance between cylinder to skirt: 0.04-0.06 mm Features: 1.Completely Phosphate Coated for increased oil adhesion and better lubrication. 2.Moly Coated skirt to reduce friction between piston and cylinder wall. 3.Oil Holes in pin hole for improved lubrication of piston pins, extending performance at temperature and rpm. 4.Lighter design with mass center optimized for smooth movement in V8 engines. Rings made in Taiwan. Fitment: Part Number: 061MP10 Engine: S85 Models: 2005–2010 E60/E61 2005–2010 E63/E64 Specifications: Piston Material: 4032 Rod Material: 4340 Bore Size: 92mm Compression Ratio: 12:1 Compression Height: 27.5mm Pin Size: 21mm Overall Height: 51.52mm Ring Size: 92x1.2+1.2+2.5mm Rod Length: 140. 7mm for S85B50 Compatibility Disclaimer: This is an aftermarket replacement part. Any brand names or model designations mentioned are used solely for the purpose of demonstrating compatibility.