Silicon Carbide Stone 6" x 2" x 1" Professional Machine and two are the finishing

and two are the finishing grade Fine cut

you will need to purchase two rods

The Hard Black Arkansas stone is finer than even the Hard Arkansas stone so it leaves a finer edge

These combination stones feature two grits on each stone for a lot of sharpening in a small package

I've had to flatten the stones

Silicon Carbide Stone 6" x 2" x 1" Professional Machine and two are the finishingSilicon Carbide Stones Silicon carbide stones are ideal for fast material removal. Their abrasive nature makes them perfect for quickly performing operations like coarse sharpening, shaping, leveling, or removing burrs after machining. Silicon carbide stones are relatively fast cutting compared to aluminum oxide stones, and are often employed when speed is important. Dimensions 6" x 2" x 1" Rectangular Available Grits: Fine 280 Grit Medium 180 Grit