Ya, it'll fit thick or thin temple pieces. Some reviewers have wondered if "wire" rims are too thin for mounting. I didn't think glasses have been made since the 1940's that had actual wire temples (with the curl around the back of the ear). I suspect many people confuse real wire rims with frames that just have thin temple pieces. Maybe I'm wrong. One of my glasses is a thin frame type and there is no problem with the grip of the mirror's mount damaging the temple arm. Just adjust (bend) the gripping tension of the three prong mounting end to accomodate the widths of different thicknesses temple pieces.