- Keeps hinge screws secured.
- No more slipping lenses.
- Made in USA
Stops slipping glasses! Helps keep your prescription, reading, and sun glasses properly adjusted. End eye strain and headaches brought on by improper lens position. Optic-Firm hinge rings give spring action to temples and help prevent loss of hinge screws.
Directions for use
Slide Optic-Firm hinge rings over temple onto hinge.
Product Dimension (each hinge ring)
Outer diameter 0.5cm x Inner diameter 0.4xm x Thickness 0.2cm
10 units Hinge Rings.