Plural: nail files
You know what a nail file is. Perhaps you prefer the term "emery board", but the concept is largely the same regardless. Despite what certain governmental figures might want you to think, this isn't a useful weapon. It'll sharpen the hell out of your finger nails, though.
Autosell value: 150
Can be welded
You get to work on filing your fingernails, honing them to razor sharp little points. You gain an effect: Scratch Your Eyes Out. (Added for 60 minutes.)
Using multiple: Same as single use