You are probably referring to a "fid." The cord can be lightly heated and screwed into the end for lacing. On simple projects they are not necessary. But as your work gets bigger, or more complicated, they definitely come in handy. You can see them used on you-tube videos. For now, a pair of needlenose pliers will do almost the same things. Later on you may want to purchase a hemostat, aka arterial forceps to use like the needlenose pliers to go under tied cords to pull a working cord through. Later on, you will see where things like awls will come in handy. You might also want to purchase a jig for tying bracelets. These sell for as little as $19.95 at Hobby Lobby, along with paracord, hemostats, and fids. Use your cellphone coupon to get 40% off one item per day. Hope this helps. And keep asking questions. It's a great way to learn!