I picked one of these up from Amazon and used it yesterday on two small door dings. I must say that I was impressed with the results. The kit includes a glue gun, two different shaped "pullers" and a crossbar with two cushions and a wing nut that pulls up the dent pullers. You simply apply hot glue to the tip of the dent puller, hold it in place for 10 seconds and then align the crossbar over the puller and gently pull it up with the wing nut. The dent pops out easily. You remove the glue with a solvent that is provided. I would guess that it would work on dents and dings up to 3" in diameter. For $26 it was a worthwhile investment.