Great fit and easy to use.

Not sure about the round end of these, but if I ever have the need, I'd bet they'd help. Still the tools themselves are just right -- got to have good hex-head wrenches or as I grew up calling them allen wrenches....

Well made, accurate. The ball end is indispensable for reaching some hardware.
I bought both English and Metric tool sets. I'll have 'em forever...

This item provides almost every kind of hex key most luthiers and players will require for instrument upkeep. The sleeve holding the keys is sturdy and compact, making it easy to keep track of tools that often easily go missing. The day these keys arrived, I was able to administer required truss rod tweaks on all of my guitars without having to dig through tool kits and drawers for right tools.

This set is essential to fit those deep seated adjustment ends ( I have the metric set)

Nice set of hex keys. the one I needed fit my Collings. Cheaper than the hardware store and right to the mailbox..

Well-made. Very useful to keep in your tool box.

I've only had the need to use them a half dozen times, but they eliminate the worry of scaring the "black chrome" fittings on my Ibanez guitar. Some allen wrenches are manufactured in sizes close enough to serve the purpose but the amount of "slop" in the tolerances slowly deforms the fasteners and destroys the finish. These have eliminated that problem for me. Well worth the money.

I purchased both metric and AS of truss rod hex keys (Allen wrenches), with difficult access to the relevant internal adjusting bolt making it hard to determine exact size to use. The round - or ball - end on these wrenches allows one to approach the bolt from the slight angle (which is necessary unless you have the specific size in a specially designed/angled tool) required because of an interfering cross brace. Short story is that the ball end enabled me to determine best fit and make required (albeit small) adjustment. If you know what size you need, get the specific and best tool. If you don't, these did their job for me, were reasonably priced and quickly shipped. Recommend.

I got both sets , and have used a few already , the quality of these is absolutely top notch , they are strong and sturdy . Why get cheap substandard stuff when for a very reasonable price you can get something that's gonna last and that you have total confidence in !!!