First of all, these are strong, durable nuts. The carving is sharp and precise and they rotate smoothly. The serrated ends allow you to squeeze them as hard as possible before removing the torque wrench. I haven't had any of the problems some here have had with obviously used screws, mine were fresh and clean. After all, they look great when installed. The only negative I have to say is that the color will fade on them. See attached photos, abrasions appear after one tightening and one removal. Hand tools only. 17mm socket, torque wrench to tighten, pry bar to remove. However, all the colored screws I've had will do, and for the price of these, if they're too worn, replace them. 😁👍