Our Diamond File and Water Stone are perfect to keep around for sharpening your tools on a regular basis. Keeping your tools sharp adds to the enjoyment and ease of using your tools in the garden. The Diamond File and Water Stones are great for Kamas, Pruners, Garden Knives, Weed Shredder, Hoes...all of which have quickly become indespensible tools on our Research Farm and in the Maine Trial Gardens.