66000Anchor Shackle 1/4 Heat treated alloy forged steel. Oversized alloy pin. Hot dipped galvanized finish. Meets Fed. Spec. RR-C-271D, Type 4A, Class 2, Design factor 6:1. Marked for Traceability: “D” marking for Dynaline. Body Diameter: 1/4”, Pin Diameter: 5/16”, Inside Length: 1-1/8”, Inside Width: 3/4”, Usable Pin Length: 1/2”, Working Load Limit: 1/2 Ton