Review (5/5): Fits in the hand well, works well, good price
I bought it for scraping my aquarium because replacement blades for my aquarium scraper were more expensive than replacement razor blades by a large margin. The razor blades rust pretty easily if I don't shake the water off and wipe it, but that is not too much trouble.
Fits in my hand nicely. Destroys super thick algae clinging to my aquarium glass.
I like that the sliding mechanism is for covering the blade rather than a retractable blade so I can scrape as hard as I need to without worrying about the blade getting shoved inside the tool.