Unusable metal is an item obtained through metalworking.
Unusable metal is a useless by-product currently serving no function.
Unusable metal does not spawn in the world naturally, however can be produced as a by-product when dismantling some metal appliances, such as metal doors and dumpsters.
From newitems.txt (Project Zomboid directory/media/scripts/)
Weight = 0.4,
Type = Normal,
DisplayName = Unusable Metal,
Icon = UnsableMetal,