Ouch - hold on! If we're talking immediate care there's no need to run safety pins through a wound, causing pain and and risking infection. And besides, there are better alternatives - pack a wound kit with steri-strips like this one, http://www.nols.edu/store/product.php?productid=16259&cat=256&bestseller. I guarantee that if you have to close a wound, the wounded person will thank you.