hot staven verbinden staaf yz450 8643Heavy Duty OE Replacement Connecting Rods, Certified 8620 AISI Steel Provides Superior Strength, Crankpins Are Manufactured From Hot Rided ASTM 4115 and Case Hardered to Level of 58 62R, feature Uniquely Designed Big End uses strategically located side scalloping and vent slots to minimize Race distortion at high rpm, small ends are double drilled to supply extra lubrication and cooling to the wrist pin bearing, which is eSPECALLY Lager, shot peened