Designed for the Make It Snappy Tools #40050 Self center hinge drill bits and the included hex wrench for replacing the drill bits. These bits are designed to allow you to perfectly drill a hole through the hole of a thin metal being attached to wood. Things like hinges, drawer slides, hanging brackets etc. This is particularly important when using tapered screw heads that can pull your bracket away from the desired location if the hole is off center.

This model provides a convenient way to mount them to the wall rather than losing them in a drawer somewhere.

The numbering on the front indicates screw size and the centering bits themselves are labeled with the actual drill size. Numbering is shallow enough that it will not print without multicolor