
I have used everything from a business card to a matchbook cover, but this unit is convenient and reusable. You-Tube Video makes it super easy to take the rubbing away. Bike Tires Direct price-matched and I bought 2 more as gifts for my cycling partners.
With the caliper mounting bolts loose and wheel mounted, I place the tool's metal arms on each side of the rotor, then squeeze the brake and tighten down the mounting bolts. It leaves me with a nicely centered rotor and the purple portion adds the function of a pad spreader tool. It's a very useful and time-saving tool!