When drilling with an electric drill, it is difficult to ensure that a vertical 90-degree hole is perfectly drilled. Even experienced masters often make mistakes, and it is difficult to estimate the drilling depth accurately. Bullseyebore is an electric drill aid that uses red concentric circles of different sizes projected to help you visually locate it, allowing you to drill vertical and accurate holes.
The center of the Bullseyebore circle is placed above the drill mouth. When drilling, three concentric apertures will be projected on the wooden board. As long as the electric drill swings slightly, the outermost aperture will change. Remind you to return the electric drill to the "right path", and the other two apertures will never be deformed. The aperture also has a depth reminder function. For example, if the diameter of the outer aperture is 5 inches when drilling begins, and becomes 4 inches after drilling, then the depth of the hole will be 1 inch. Bullseyebore is shaped like a transparent disc and has certain impact resistance. It has a built-in laser transmitter, other optical components and batteries and can be installed on any electric drill bit.
