Preformed Line Products GDE-2106 C-Coat GUY-GRIP® Dead-end: Galvanized Steel. For use on: Extra High Strength, HighStrength, Siemens Martin, Utilities Grade3. Strand size 5/16", Strand Construction 3W / 7W / 7W, Mean diameter .312" / .312" / .327", Length 31", Color code Black