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 .5" (178mm x 13mm)
Sold in a pair, 204D triangles fit into the 204 Sharpmaker sharpening system. To Clean: rinse in fresh water.
For keeping sharp blades, tools, and toys in optimal working condition, this Spyderco sharpener set is top notch. Called the Tri-Angle Sharpmaker, the unit includes two sets of high alumina ceramic stones: a pair of medium-grit (brown) stones for aggressive sharpening and a set of fine-grit (white) stones for professional-grade finishing. The stones are triangular for sharpen..