I see this as a marking tool, or scribe, with 6 rotating sharp points. The fact that it looks like a fat fish, is purely decorative, and to give it girth to hold onto, along with the scales lines. Just my first WAG! PS: forgot to add possible sheetrock scoring tool. PSS: I call these little keychain tools, advertising gimmicks, probably given out free at the local supply house, and not meant for production, or everyday use. That's my last edit folks! lol