1: A piece of MILD steel big enough to make the tongs. I used some 20mm wide by 4mm thick by 1 meter long, giving me tongs about 50 cm long when I'm done.
2: You'll need a metal vise sturdy enough to stand all the bending that's going to be happening, 2 pairs of heavy-ish metal pliers, a hacksaw, for cutting the metal
3: You'll also need a blowtorch capable of heating this much steel into its plastic state (A fairly bright red colour) and the relevant protective gear. A drill and a bolt, to make the hole and hold them together are also pretty important.