One of the most versatile of the Pull-Thru Knife Sharpeners available from Smith's is a Ceramic Pull-Thru Knife Sharpener. This sharpener uses pre-set crossed ceramic stones to bring your knife's blade to razor sharpness. The triangular shaped ceramic stones can be used on either straight or serrated edges. Like the other Pull-Thru sharpeners, it has an ergonomically designed, soft grip handle and non-slip rubber feet for comfort and steadiness when sharpening. The Ceramic Pull-Thru Knife sharpener works best when trying to sharpen very dull or damaged blades to razor sharpness, but can also be used to maintain the edge on already sharp knives.