Preformed Line Products BG-2146 Big-Grip Dead-end. GALVANIZED STRAND. For use on: Extra High Strength, Siemens Martin High Strength, Utilities Grade. 5/16", Strand construction 3W / 7W, Actual Diameter .312/.312", Approx. Length 33", Black, Rated Holding Strength (lbs) 11,200.(Percent of Strandes Rated Breaking Strength - 100%)