Sigma DG Corp is an exclusive supplier of Mateen GFRP (glass fiber reinforced polymer) bolts and threaded rods. We focus on the following industries: concrete forming, earth retention, mining, tunneling, oil industry, roads, bridge, and marine. We are partnered with Pultron Composites out of New Zealand and combined have well over 35 years of composite experience and know how. Sigma DG offers: Composite bolts, nuts, plates, rebar, and dowels. We also specialize in injection molding using unique and incredibly strong materials. Our website: www.mateenfrp.com