To get the best drill bit for hardened steel bolt is quite a challenging task because most of the time the drill bits you get along with your drilling machine don’t do the task efficiently and make messy and imperfect holes in hard surfaces like steel.
Multi-purpose tools make your days easy and would be proved as a money saver. The best automatic center punches definitely the most useful tool to make a sweet dimple on the surface of any metal, wood, stone, or plastic. It is not just a mark but a function that guides the drill. Photo Credits: MAURO CATEB.