I use them to make signs on my CNC router. As long as they work well. I like that they have a 1/4" shank. Saves me changing collets when changing from a larger bit. Each nozzle comes in its own durable plastic case, rather than the flimsy, puffy plastic sleeves that come with most They seem to cut fairly cleanly I've only used one so far but I've looked at all the parts and they all seem to be of the same quality Can't comment on durability until I've spent a lot of time on them but so far so good For the price I can't complain.