The width of the blade from the top of the spine to the bottom of the cutting edge is referred to in eighths or an inch. So a 5/8.6/8,7/8 and so forth.

Dovo does make stainless blades as well. AFAIK the steel will be the same in HC of SS and the price deferential will be due to ginger bread like gold wash, fancy scales etc. I could be wrong about all of the steels being the same.