Use this fret bender to bend frets and fretwire in the desired radius. The height of the black rubber wheel determines the radius of the frets. This is dialed in by adjusting the wheel on top of the fretbender. After the correct radius has been dialed in you can lock it by tightening the nut on the back of the fret bender.

Straightening frets is also possible. To do do move the wheel on the right to the left of the black rubber wheel.