DIA SCREW PIN ANCHOR SHACKLE 1. OEM for this item 2. 3/16, 1/4, 5/16 ,........2-1/2 3. Federal RR-C271DtypeIVB DIA SCREW PIN ANCHOR SHACKLE1. specialized manufacturer 2. 3/16, 1/4, 5/16 ,........2-1/2 3. Federal RR-C271DtypeIVB DIA SCREW PIN ANCHOR SHACKLE