A must have for vintage clocks.for years had a clock could not use, these keys put it back to work, recommend themI purchased these in the hopes they might work in the smaller ‘fast/slow’ slot some mantel clocks have at the top of their dial. They did and thankfully I’ve been able to adjust some of my antique clocks now!They feel sturdy, look nice, and seem like they’ll last for many years to come!the only problem i have is that some clock faces will interfere with winding.its the clock, not the key,I lost the clock key that was made for my clock and it sat idol for years. I happened to see these and ordered one of each and it worked like it was made for my clock. A bonus I used the other one on a clock that never worked, (I really liked the case) and now it works!!!!Key is OK and arrived on time. It doesn't fit the clock. Needed 2mm, not #2 key.Needed a key to wind an old Grandfathers clock. This key had all the options necessary to do the job.fits well no problems. better than the original key my opinion.Yes, it's really good to have these. Very happy with the set!I need only one but its good to have set