I was impressed with the presentation/packaging haha. These are definitely solid nuts, not cheap ones that break like a cap. Many comments speak of 21mm, 20mm, 13/16 etc. try 21,20,19 and 13/16. Only fit 13/16 but was too big. Seems like 20.5mm would be great lol. They fit my wheel on a 2013 Malibu. However, they were barely wide enough, so check out the specs. I had no trouble putting them on, very smooth.