eliminating the risk of screws falling out

no hinges at the edge of the lenses

Bridge (DBL) about 11/6 inches (18mm)

Bridge(DBL) about 7/16 inches (12mm)

Lens width about 2 1/8 inches (54mm)

4 Pack Modern Bifocal Reading Glasses Thick Frame Readers BR2111 Magnification Strength:+2.50 eliminating the risk of screwsAcrylic lens, plastic frame with spring hinges Frame width about 5 9 16 inches (142mm) Lens width about 1 3 4 inches (45mm) Lens height about 1 7 16 inches (37mm) Bridge (DBL) about 1 2 inches (13mm) Temple length about 5 5 16 inches (135mm) EYEKEEPER BIFOCAL GLASSES A crescent shape on the bottom part of the lenses have magnification, which is for reading and close up work. And the other parts of the lenses have no magnification,which is for distance