Cobalt Drill Bits are made of cobalt and steel alloy in different proportions, and they are meant to drill into tough surfaces such as cast iron and stainless steel materials. They can, however, be used to cut into soft materials too. These bits are quite expensive compared to other types. However, they are a bit brittle, and therefore should be used with care. Titanium bits are coated with a tough titanium layer for durability and fitted with a speed tip…