These lug nuts have two-piece bodies that allow the top of the lug nut to spin while you tighten or loosen the lug nut, and the seat to stay in place so it doesn’t grind against your wheel. The aluminum body makes them incredibly lightweight – about the same as titanium, but at a third the price! They’re hard anodized to ensure the most durable finish possible, and have stainless steel inserts to withstand abuse and prevent galvanic corrosion.
Essentially, they’re over-engineered to be the best lug nut available, and as light as titanium but at a significantly lower price.
These lug nuts require a 21mm socket. I highly recommend using 6-sided sockets (not 12) as they have better contact and will reduce the risk of cosmetic marring.