Metolius Ultralight Curve Nut: Solid to Place, Stubborn to Clean
Back when I learned how to trad climb seven years ago, I got used to using straight-tapered nuts. Despite the ease of cleaning them, this design, which was popular in the 1970s and ’80s, fell out of vogue. This is because curved nuts are just more versatile and fit in irregular placements, but they do have a tendency to get stuck.