Barrel Buff is used to polish in tight areas. They are designed specifically for polishing in the holes of wheels. The cone can also be used underneath the valve stems where you can't get into with the buffer. We've seen polishers also use these in between the lugnuts. Just apply a little bit of compound or hand polish. The cone buff has the stud to be attached to a drill. Whether spinning at high speed or low speed it works both ways. We personally recommend using the Rebel Red or the Pro Red with the buff. Rebel red is best used if the wheels are in good shape. Likewise if the wheels are in rougher shape the pro red is best used.