I didn't understand the photo in the ad, but these brushes turned out to be very durable! I had 200,000 miles of rust in four hitch mounting bolt holes. My heaviest tool was a properly sized tap, which I alternated between my fingers, a vise, and a 3/8 variable speed drill bit. Between tap attempts, I fired the PB Blaster, let it sit, and then drilled each hole. The durability and length of these brushes were important in the cleaning process between taps. Probably a total of 4 hours - lots of false starts in the first 2-1/2 hours; only an hour and a half when I had these brushes at work! Now they are cleaned and packed for the next rehab project :)
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