This thing is a huge time saver, I used it to clean the box on my truck to prep the bed. I ran it on low settings in my cordless drill. This makes my drill very heavy when I hold it and it's quite a large diameter. to find a smaller brush. It's perfect for the bottom of the box, but the sides around the wheel arches are a little tight. A few quick passes will take the shine off right away, sit too long or the metal cup hits the surface and you're into primer or metal pretty quickly. I've done over half the box so far and it still looks new except for the dust on it.