*1 piece of wood (eg. oak) of ~ 80 * 3.5 * 1 cm (32" * 1.5" * 3/8")
* 64 wine-corks
* wood-glue (preferable waterproof)
* wood oil
* Saw, preferable a jig saw
* Cutter knife
Time : takes about a day to complete : mainly because you need to glue a row of corks, and then wait for the glue to dry.
Step 1: Make a mold
It is very simple : cut a square hole out of a piece of leftover wood, eg an MDF board. If you want to make a lot of pot holders, you can cut several mold-holes out of the same board.