ViperSharp Diamond Sharpening Stones are here! The extra fine stone is for those who have a higher end knives and steels they are finally here. The ViperSharp diamond stones will give you the edge you need no matter how tough your knife is. Diamond sharpening stones are known for their durability and These stones will have a few days lead time for shipment. The diamond stones are a continuous monocrystalline diamond surface on steel plates. This is new for the ViperSharp and I am working on a slight delay for each order right now. Once we have a continuous stock of diamond stones the price will go back to the normal price.