The stones are amazing. They put a sharp edge on knives and wood working tools fast. You have to clean them. I use windex widow cleaner and they work just fine. And you may want to build a wooden base for them to. I did and it made them even more handy to use. You can’t go wrong buying these. They are well worth the money. If your wood working and want sharp tools these are the stones. I sharpen wood plane blades, wood turning tools, wood chisels, pocket knives, kitchen knives, hunting knives, and wood jointer electric knives on them. They work well for sharpen scissors to. Yes I would buy them again.