High strength, exceeds that of high test G4 Chain. Hot dip galvanized on both the shackle and the pin. 30% stronger than standard grade. Identifiable with bold black colored pin. Exceeds federal specification RR-C-271 Type IV Grade B. Working load limit and size stamped on each shackle. Bulk packed. 1 Year Warranty Size 1/2" Pin 5/8" Max Load 7260 lbs. Break Strength 36300 lbs.