Professional quality Diamond Whetstone. As used by British Aerospace and Rolls Royce. Credit card size. Double sided with fine 600 grit (25 micron) and coarse 300 grit (50 micron) surfaces.

Ideal for WoodRat HSS as well as carbide cutters, turning tools, chisels, plane blades, carving tools etc.

Grit sizes are clearly marked on each surface. A storage wallet is included.