For producing the fastest cutting edge on all types of knives, the Coarse Hone is included in every Sharpening System excluding the the Diamond and Arkansas series. The coarse grit is ideal for sharpening a very dull blade and repairing blemishes or damage to an edge.
Key Features:
Coarse Grit (120) Alumina-Oxide Hone
The Medium Hone works best in conjuction with coarse hone and fine grit hone. The medium hone is included in every Sharpening System excluding the the Diamond and Arkansas series. The medium grit is ideal for smoothing out deep scratches from hard blade use or from an extra-coarse/coarse abrasive hone.
Key Features:
Medium Grit (280) Alumina-Oxide Hone
This Hone works best in conjuction with the series of coarser hones to refine and polish a already sharp edge. This fine hone is included in every Sharpening System excluding the the Diamond and Arkansas series. The fine grit is ideal for maintaining an already sharp blade and smoothing out scratches from a medium grit abrasive hone. 
Key Features:
Fine Grit (600) Alumina-Oxide Hone