If you’ll ask me which drill bit to obtain or use in terms of drilling holes on metal surfaces like aluminum sheet, brass plates or stainless steel pipes then I’ll reveal to you that I’ll take cobalt drill bits with no hesitation. There are people who think that cobalt drill bit sets are expensive than normal steel bits. They are correct but they are probably not seeing more in to it. You see, you can use normal steel (HSS) drill bits to bear holes on metal surfaces. However, problem starts to manifest after long period of using the bits. The main culprit behind this phenomenon is high temperature – heat due to friction between 2 metal surfaces. And now I’ll tell you why I’ll choose a cobalt drill bit instead. Well, cobalt bits are simply resilient against high-temperature drilling because of the cobalt element imbued on the bits’ surface. It channels heat away from the bits making it perfect for every metal surface drilling task.