The Fissman knife sharpener with 3 stages with carbide, diamond and ceramic stones helps to restore a super sharp cutting edge to blunt knife blades that that have dulled with use.
Place the sharpener on a flat steady platform. Push a button and turn a handle to open the sharpener.
While holding the knife in one hand and the sharpener in another hand move the blade along the surface of the stone with a gentle pressure.
For rough sharpening use of seriously damaged knives with a blunt blade use the first and the second slots.