Okatsune Curved Edge Sharpening Stone
This versatile stone is designed for sharpening fine quality Okatsune tools, as well as other bonsai and garden tools. It fits easily in your hand and has one curved edge for sharpening concave cutters and other curved blade tools, and a flat surface for sharpening tools with flat blades.
Works best if soaked in water for a few minutes before using. Made in Japan by Okatsune, one of very best hand tool makers in the world