The Curved Diamond Whetstone is a uniquely shaped stone specially designed for the sharpening of wood turning tools and carving chisels. Its curved diamond surface lets you sharpen both concave and convex surfaces. The small end has a radius of approx. 3mm (1/8in) and tapers up to the large end with a radius of 28mm (1.1/8in). Coated with mono crystalline diamond in 600G medium and 1200G fine grits. Can be used dry or with water as a lubricant, no oils are necessary. Features: Sharpens convex and concave wood chisels Radius tapers from 3mm to 28mm Radius tapers from 3mm to 28mm Use dry or with water, no oils necessary Specifications: Dimensions: H:37.5 x W:2.5 x D:15.5 cm Colour: Silver Guarantee:5 years Material: Metal Model Number: FAIDWTURNING