Good product, I use it in a mechanical workshop. We use it to clean the caliper bolt holes during brake work. Stick them in a drill press and drill out any rust or debris and you're done. Different sizes help. I don't know how strong they will be in the long run, but for quick, easy cleaning jobs in hard-to-reach places, it's perfect. Hand tools and extensions are completely useless because you need speed to clean everything properly. Overall a pretty cheap price for what it does. Snap-on had a very similar set on their truck and wanted 4 times the price of this one on Amazon. They are cheap enough that when they wear out you can easily buy another one.
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