Drop Forged US G209 rigging shackle 1. manufacturer 2. 3/16, 1/4, 5/16 ,........2-1/2 3. Federal RR-C271DtypeIVB Drop Forged US G209 rigging shackle 1. specialized manufacturer 2. 3/16, 1/4, 5/16 ,........2-1/2 3. Federal RR-C271DtypeIVB US Type High Tensile Forged Shackle G209