• 3 Rod Sharpeners: No more concerns about finding just the right angle with precisely placed rods.
• Safer Than Other Tools: The handle of this sharpener is located to the side of the rods, so your hand is safely away from the moving blade throughout the sharpening process.
• Stable Countertop Design: Solid ABS plastic body and slip-resistant rubber feet mean your sharpener is easy to handle and stays put during use.
• Sharpens All Size: From Paring Knives, Chef's Knife To Hunting And Survival Knives, This Sharpens ALL.
• CAUTION- Clean the knife with the water or wiper and dry it after use. Do not put the sharpener into the dishwasher or water,please keep it dry and clean. Do not overpower and back and forth when grinding.

Usage:

Step 1 : Tungsten steel blade , for coarse sharpening when knife is very dull .

Step 2 : Diamond rod , for coarse sharpening when knife is not very dull .

Step 3 : Ceramic rod , for fine sharpening , to polish knife .

So you can choose 1 & 3  or 2 & 3 according to the knife .

And you also can use diamond rod to sharp ceramic rod , but it need to be carefull as  ceramic knife is very crisp .