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I have been using Kester solder for over 35 years. It is the only brand I purchase. I get some odds and ends when I buy a soldering station or something. Those are hit or miss. Kester always works.
I saw a pose that the diameter of this solder is too small to be any use. There are different diameters for different applications. For detailed electronics work, small diameter solder is used to keep from applying too much solder resulting in solder bridges or other problems. I use this size most of the time. If you need to apply a lot of solder, then a larger diameter is helpful. For example, soldering 12ga wire to terminals. If you have these applications, just get two sizes. You can also cut a piece of solder and fold it to make larger diameters.