Roach clip
From Wiki Weed
A small, usually metal device that clamps on to the end of a joint, enabling you to continue smoking without worrying about burning your fingers. When using a roach clip, it’s important to make sure you ash the roach to prevent said ash from flying into your mouth, a most unpleasant end to a smoking experience. There’s also a great propensity to burn your lips, so most people make a stoner version of duck-face when using a roach clip.