This scratch brush allows you the access to clean and of the sanding of hard reaching areas. It will go where things like files, sanding blocks, plain sandpaper, emery cloth cannot reach. As well as --- other tools in the cleaning process.
Awesome for the clean up of electrical type contacts and removing corrosion / rust on the surfaces with lots of fragments, details or debris. You can use to sand around paint that has chips. That is, before touching up and prepping the surfaces with glue areas. Finally, ideal for cleaning up but not restricted to solder pads on PCBs etc. It's a really nice product and can be hard to find.