Heavy Duty Turnbuckle (TYPE T2) The T2 series highlights GN Rope Fittings’ engineering expertise in providing high-capacity tensioning solutions for critical mooring and rigging systems. Also known as rigging screws, these components are designed to meet the rigorous requirements of Dutch, British, American, and other international dock regulations. They are specifically engineered to provide adjustable tensioning while maintaining maximum structural integrity in demanding maritime environments.