The stones that usually come with a grinder are too coarse and too hard for dry-grinding hand tools.
Our grinding stones are aluminum oxide with a soft bond (grade H) and an open structure. They will wear faster than hard stones but will not burn tools as readily.
With a bit of experience, you will find that you can quickly grind a nick out of a chisel without overheating the tool.
Two grits are available. The 80x wheel is best for chisels and plane blades; a 120x wheel is available for carving tools.
Both the 6" and 8" wheels have 1" arbor holes; the 6" has 3 bushings (for 1/2", 5/8" and 3/4" shafts); the 8" has 2 bushings (for 5/8" and 3/4" shafts). Maximum rpm is 3820 for the 6" wheels and 3600 for the 8".
These open-structure, friable bond stones are custom made for Lee Valley.
Note: The 8" wheel should only be used on grinders that are designed for 8" wheels, with no modification to the grinder.