If you own a drill then you will be familiar with drill bits as these are the pieces that work with your drill to do the hard work for you. The difference between an average HSS drill bit and a cobalt drill bit is that the cobalt drill bit has been made using cobalt steel blended with a high percentage of cobalt. Cobalt drill bits are well known for being very strong and resistant to heat and are perfect for drilling most metals including: titanium and stainless steel.