Hexagonal fronts are less common than round or square ones, and the Ray-Ban RB3548N uses one — paired with 145mm metal temple arms, which is what this compatible set matches. Because the hinge sits at an angled facet rather than a flat edge, arms built for a round or square RB model won't seat cleanly here even at the same 145mm length.

Metal arms on angular fronts like this one tend to show wear first as thinning plating at the two points that get the most contact: where fingers grip to put the glasses on, and where the arm rests behind the ear. Once bare metal shows through, the arm itself is usually still structurally fine — it's a cosmetic issue, not a fit one. A scratched, years-old arm and a fresh aftermarket one hold the hexagonal front the same way.

Frequently asked questions

Can I replace just one arm, or do I have to buy both?

You can order a single side if only one arm on your 3548 is broken or scratched, or buy the pair if both need replacing — either way they match the mm length exactly.

My hinge feels loose — will new arms fix that, or is it the frame that's worn?

A new mm arm includes its own hinge barrel, so if the wobble is coming from worn threading on the arm side of the 3548, replacing it usually restores a snug, tight fold.

Are these official Ray-Ban replacement parts?

These are compatible aftermarket arms, independently produced to match the 3548's hinge and mm length. They aren't manufactured or supplied by Ray-Ban, just built to the same measurements so they attach correctly.

How do I know these arms will fit my Ray-Ban frame?

These arms are made specifically for the 3548, matching its mm length and hinge design, so they attach to your existing screws and hinge without any filing or adjustment needed.