Preformed Line Products GLS-2117 Galvanized Steel, C-coat Strand Splice. 5/16", Strand construction 7W, Mean diameter .327", Length 29", No. of subsets 3, Color code Black. PREFORMED™ Strand Splices are used to repair strand or messenger simply and economically. All applications can be checked visually —no guess work involved. Because of its superior design, the Strand Splice provides maximum strength and excellent fatigue characteristics resulting in longer life for both strand and messenger.