Capo Width
Measure your fretboard width…
The Capo tube is in 1/8” increments.
You want the tube to be the same width or slightly narrower than your fretboard. It is important to cover the strings. It is important that the tube not be wider than the fretboard or it will be difficult to tighten.
In the photo, the fretboard is 1 7/16” so select 1 3/8” in the width dialog.