pin drill
Noun
Meaning
pin drill (plural pin drills)
A drill with a central pin or projection to enter a hole, for enlarging the hole, or for sinking a recess for the head of a bolt, etc.; a counterbore.
Noun
pin drill (plural pin drills)
A drill with a central pin or projection to enter a hole, for enlarging the hole, or for sinking a recess for the head of a bolt, etc.; a counterbore.