The 2 tops included are a wrench and a hex-bit holder. Both are meant to be put on top of a standard number 2 pencil. The third apparatus is the grip for the pencil so it doesn’t slip when you are wrenching, or when you are screwing something in. It would go on the bottom of the pencil so it won’t stab your hand while you use the Tops. The Pencil Tool Tops both have a small ring on the side of them so that they can be strung together so they won’t get lost.