What is the difference between Gritomatic Silicon Carbide and Boride CS-HD

while Gritomatic offers 5 grits only

To be used with water

Universal Angled

edge pro apex knife sharpener Variation:Apex 4 What is the difference betweenThe Edge Pro Apex knife sharpener kit is a patented wet stone sharpening system that will sharpen any size or shape blade (up to 3 " wide), including serrated knives. Knives can be sharpened at exactly the same angle every time, making re sharpening so fast you will never work with a dull blade again. The Edge Pro Apex stones in our wet stone sharpening kits have been custom formulated to free you from messy, gummed up oil stones. They last a long