Abstract: A wrench of the present invention includes a main body having a handle and a driving portion. The main body is made from aluminum alloy, which consists of Si, Fe, Cu, Mn, Mg, Cr, Zn, Ti and Al. Specifically, the aluminum alloy has less than 1% by weight of Si, less than 1% by weight of Fe, 1-5% by weight of Cu, less than 1% by weight of Mn, 2-5% by weight of Mg, less than 1% by weight of Cr, 5-9% by weight of Zn and less than 1% by weight of and the rest part thereof is Al.