Item advantage: 1.all iron steel. never damaged. 2.perfect fit with scissors and planer tool.more items fit. 3.huge angle of the edge of knife. fit 5 ~ 90 degree. 4.more flexible to use.can press the knife on the sharpener when you are not skilled.a backer behind. make the blade of 2side the same wide.when you are skilled,can not press,easy to use. 5.faster, convenient to change different stones 6.safer 7.less space to pack Feature: 1. Our product is made of full Stainless Steel;Yet the normal one is made of Plastic! 2. Our products' Handle is on the above of the knife Blade.It's super.Safe Never Hurts your hands! Yet the Other seller's handle is just face to the knife Blade,It's very Easy to Hurt your hand. 3.The Locks is easier to Tighten the screws by hand,you needn't Screwdriver! Never Shaking! 4. We've added new function,It's would fixed with Scissors,Peeler,saws and the other tools.More items fix with it! 5. It's easier and Fast to Change the Whetstones as you want Package includes : 1 . Knife sharpener 2. 4pcs whestone(120#+320#+600#+1500#) 3. Packing case