When drilling metal it is more about going slow and using a cooling agent, if need be, than having a special drill bit. Cobalt and titanium coatings help control the heat problems, but if you go slow enough just about any drill bit will work. But if you're drilling many holes in metal, a specialized metal drill bit is a must-have. Tool King has a a vast selection of sizes and lengths of metal drill bits to fit just about any need. With prices this low you can afford to stock up so you never run out.