Self Centering Drill Bit How to properly install new door hinges! In this quick video we demonstrate how a self centering drill bit makes it quick and easy to install a hinge. When installing door hinges even the slightest misalignment can make it difficult to properly install a door. That’s where this quick and easy tool comes in handy. This dill bit gives you a pilot hole directly in the middle so your screw can sit flush. This bit was purchased at Lowe’s but you can almost find them anywhere