The Spyderco Tri-Angle Sharpening Kit (204F) was the very first product Spyderco ever made.
Medium and Fine Gritstones make this kit the only one you need. The triangular shape allows you to sharpen plain and serrated edge knives.
The base allows for easy travel and setup. There are three-angle settings: 15 degrees on each side, 20 degrees on each side, and 12.5 degrees for scissors.
If this is your first sharpening set this kit comes with a great instructional video.