I normally work with molten glass and use an electric grinder if necessary for most jobs, but I have done very specific projects that have required hand grinding. I was a little afraid of it, but I have to say that it was very quick and easy with this sharpening stone. It only took a swipe over every sharp edge and corner to safely handle the broken glass. I'll be using it extensively in my cold jobs and it's absolutely less fussy than having to set up my grinder for smaller jobs.