I get little metal slivers all the time, best way I've found is to scrape the skin with a knife blade. It'll usually catch the tail and pull them out, without all the cutting and digging. I usually force myself to wear gloves, but I'm still taking them off for certain tasks, and invariably I'll find something sharp to cut myself on. All thread is probably the worst (followed closely by unistrut), razor sharp little hook if they didn't debur it, and they often don't. I never understood why people wouldn't take 2 seconds to take a couple licks with a grinder or file so someone doesn't bleed from their work, but thus is life.