Credit card size diamond hones for sharpening all kinds of blades. Hard nickel plated steel, with fine 320 grit diamond grit on one side. 82mm x 50mm area of diamonds. In plastic wallet.
Ideal for HSS turning tools of all kinds especially the tips of hollowing tools. Works on tungsten carbide (router cutters etc) as well. Can be used wet or dry. Fits in top pocket or hangs on nail/small hook.