Simple, quick and very effective, these new quick sharp knife sharpeners have 2 sharpening edges, Carbide for basic sharpening and a ceramic edge for finishing. You simply pull the knife back through the sharpener at a 90 degree angle, maintaining a light pressure and repeat until sharp! Pack of 8 sharpeners. Pack of 8 with Display box - KNI2315731Pack of 8 refill - KNI2315901