PRODUCT HIGHLIGHTSPrecision CNC Machined Piston Kit: Accurate dimensional control for OD 100mm outer diameter and 34*84mm piston pin size, perfectly matched for 4D30 engine overhaul to eliminate assembly clearance deviation High-Strength Aluminum Alloy Material: Outstanding heat dissipation, anti-ablation and anti-deformation capability, maintaining stable performance under high-temperature heavy-load operation of commercial vehicle engines Multi-OEM Standard Replacement: