Chicago Class 2 Screw Pin Shackle, 1". Class 2 Screw Pin Shackles. Heat treated shackle body and pin; Made in the U.S.A. Meets Federal Specification RR-C-271D Type IVA, Grade A, Class 2 3/16", 1/4", 5/16", 7/16", 1/2", 5/8", 3/4", 7/8" and 1" sizes;...