Wiseco S721 Piston Pin
Wiseco S721 Piston Wrist Pin (21mm)9310 Material Pin Features: •   High quality low carbon case hardened steel •   Case hardened to 59-63 Rockwell C •   Ground to a superfinish (.025 Ra or better) •   Designed for use in applications which require high surface strength combined with high core toughness •   Excellent when high contact stress is combined with high shock and impact loading such as turbo / nitrous applications