as well as my "Dowel-It" dowel clamp and original me I chose this particular set of drill stops from General Tools because some of the older reviews said they were made in the USA, but unfortunately that is no longer the case as the packaging now says Made in China in German All things considered this still pretty decent drill stops. There are no size markings on the cuffs but I don't know if that matters as you can only see them with the appropriate drills. The small socket head screws seem to hold them in place well, but I've found that they sometimes hold better and sit flatter when tightened against the inner wall of the drill rather than the outer edges of the flutes as intended. Since the standard socket head cap screws on the three largest rings are not long enough for this, I ordered longer M4 X 8mm screws from McMaster-Carr. These stops didn't come with an actual storage case, but they did come in a small clear plastic tray that I use to keep the set together in a parts box on my workbench. Overall I liked this set. Value. They're easy to use and work as intended, so should suit my needs.