This double action spring hinge is designed for plastic spectacle frames. It is designed with a wire core with the "SMART" patented anti-rocking system. Models of various specifications are available for selection.

• Available with metal and plastic combinations.
• Excellent craftsmanship.
• B970-50 with SMART 4.8, B920-71 with SMART 4.3, B972-50 with SMART 3.5.