6" metal ruler set includes two rigid but slightly flexible rulers with both standard and metric measurements that line up against the end of the ruler. A great tool for measuring wire and can even be used to bend measured right angles with ease.
I love, love, love this ruler for wire working. It is small enough to fit in my tool case with ease. One side is metric (for those precise mm measurements) while the other side is standard measurement. The best part is that it is a package of two so if I lose one I got a backup waiting.