2 Stage Knife Sharpener. 7 3/4" overall. Black polycarbonate housing with built-in handle and lanyard hole. Both sides of the blade are sharpened simultaneously with just a few strokes. Stones guide the blade to a perfect angle every time - eliminates guesswork and unevenly sharpened blades. Blue Diamond Stones set a new edge. White fine-grit ceramic stones give a final polish.