Review on 2-Piece Metal Scribe Tool Set with Tungsten Carbide Tips - Engraved Pen for Glass, Wood, Ceramics, and Gold by Kelsey Brown

This will scratch everything. It works well. Don't use it to comb mosquito bites. Although it will get the job done, you will bleed. I used it to scrape the steel to mark cutting lines. I've also found it scratches messages easily onto the windows of stores with exceptionally poor customer service. With practice, pretty elaborate messages can be painted onto the glass of these establishments, warning potential customers of certain horrors inside. These scribes are more useful than I thought.