Superior Tool 99643 4-in-1 Fitting and Tube Brush 1/2 & 3/4 Inch-Four in One Pipe Cleaner-Half and Three Quarter Inch , Red

I was installing a trailer hitch on my SUV, bolt holes needed some rust busted, this worked perfectly. I also didn't realize the brushes themselves are replaceable. I'll have to look into how to get the replacement brushes if I ever need them.