If you're looking for a wheel for tough applications, the Tormek SB-250 Blackstone Silicon Wheel will do the job. It was developed for shaping and sharpening* very hard and exotic alloyed steels. The combination of abrasive hardness, shape, and grain size, is optimized to work efficiently at the Tormek system's low RPM. Its faster material removal is an advantage especially when shaping tools with a large bevel surface, where the grinding pressure is limited, for example, planer blades and wood turning skews.
The 220 grit size is the same as the Tormek Original Grindstone and can be altered to work like a 1000 grit stone with the Stone Grader SP-650 (#19183 - sold separately). Thanks to its sharp and relatively small grains, the Blackstone removes hard steel efficiently even at low grinding pressure. The Blackstone Silicon also offers exceptional wear resistance. It can even touch up tungsten carbide, where the tool already has an established shape. Wheel is 10" x 2". Sweden
*Shaping vs. Sharpening - A distinction should be made between the shaping and sharpening of a tool. When shaping you remove steel to achieve the shape and edge angle you want. When sharpening you just touch up an existing shape to renew the sharpness.