These are steel triangles blanketed in a bonding agent then covered in diamond particles. Diamond hard abrasives are recommended when you wish to remove stock, for restoration purposes and to aggressively re-shape, re-bevel and re-profile a cutting edge. 7" X 0.5" (178mm X 13mm)
Sold in a pair, 204D triangles fit into the 204 Sharpmaker sharpening system.
Use them dry, without oil, water or lubricants. To Clean: rinse in fresh water.