Lansky Universal Mount Professional Machine The first stone is the

The first stone is the fast-cutting Coarse Crystolon stone

325" and 3/8"LP

and we even have instructions

The description mentions levels of grit such as medium-fine

The extra thickness provides clearance for your knuckles if you are using it on your bench

Lansky Universal Mount Professional Machine The first stone is theMade of compact, lightweight aluminum, the versatile Universal Mount is designed to optimize your Lansky Sharpening System. The mounting system allows you the convenience of sharpening numerous knives or larger size blades easily. Flip over feature permits both sides of the blade to be sharpened without additional handling of the blade. Pre drilled base can be screwed to your work bench or clamped to any work surface. 2 piece mount disassembles for