The one I used is solid steel,diamond coated on one side ans 3"x8".I wanted the 3" width because of the Grizzly's length.The steel hones cost more.The Grizzly is 3 3/16" long and the stone you are looking at is 2" wide.They are a thin layer of perforated steel,coated with diamond and bonded to a piece of plastic.Not that they won't sharpen but two entirely different hones.
To be honest,you can do the same thing using various grits of wet or dry sand paper on a flat,true surface like steel plate,heavy glass,smooth ceramic tile etc.
I would start with 220 grit and go as fine as you want.I go to 2000 grit.With the new,improved grind on the Grizzlys,this should go pretty fast.