The ball-end concept is new to me but it works where conventional Allen wrenches do not reach. The tool holder fits each wrench snugly, no worries about wrenches getting lost. The holder even functions as a handle; often I don't need to take the wrench out of the holder, just turn the wrench 90 degrees and go to work. No risk of losing that crirical wrench. This kit contains all the hard-to-find smaller sizes. The price is right and the shipping was fast. A good tool experience.