The Ray-Ban RB3447 Round Metal pairs a circular metal front with slim 145mm temple arms — the same length and metal build used on this compatible pair. Round-front models like this one rely on a narrower hinge plate than square styles, so getting the length and metal gauge right matters more than it does on a boxier frame.

On thin metal arms, the first part to fail usually isn't the metal itself but the plastic tip sleeve near the ear, which hardens and splits well before the wire underneath bends or corrodes. It's worth checking that sleeve on your old pair before assuming the whole arm is worn out. Where the arm itself is bent or the hinge is loose, a compatible replacement is the cheaper fix next to sourcing a full round-metal frame.