It is essential to know the properties of your drill bits before attempting to use it. For example when drilling with wood or concrete, you need to employ the right type of drill bit to do the job quickly and easily (without damaging the bits or the surface). When it comes to metal drilling, one should remember to use cobalt drill bits. Why? because they are proven to be more efficient on this type of job unlike other steel bits available. The secret lies on the cobalt element integrated on other metal elements on these bits. Even with just an ample amount of cobalt (around 5%), it makes a lot of difference. You can compare it using your regular steel bits and a cobalt drill bit while drilling on a thick steel panel. With prolong use, the normal iron bit will get dull unlike the cobalt bit counterpart. It maintains its sharpness.