Each tap drill is engraved with a label, which is convenient for you to choose the size that suits you. The convenient ¼-inch (6.35mm) hex shank has a tapered end to prevent excessive knocks.

If a bit is stuck inside an impact drill because the collar is stuck, you can either spray WD-40 on it and let it sit or you can place vice grips around the collar and lightly tap it with a hammer ...