This Ultra-Fine ceramic stone tightens the blade's scratch pattern to an even keener degree for hair-popping professional sharpness and polishing. Fits the 204 Tri-Angle Sharpmaker system. Sold individually...

Spyderco Knives - Ultra Fine Triangle Stone: Model SC-204UF1. Measures 7" overall. High Alumina Ceramic construction. Ultra fine grit. Fits into the model 203 Sharpmaker sharpening system. Made in Japan.

Spyderco Triangle Sharpmaker Replacement Ultra Fine Grit Rod