Covers all 22 frets on my 25" scale guitar and 22 out of 24 on my 26,5" scale, but with the natural motion of sanding back and forth with your hand it still sands all the fretboard with every pass.
Comfortable to use and has it's weight as advertised, includes 3 sanding paper stripes. It's worth it to buy a couple of rolls of adhesive sanding paper if you plan on levelling the frets on many guitars. They also sell those here in Thomann, and they're also made by MusicNomad for this tool.