chuck
It's the part of the drill that holds the drill bit.
"chuck"
The drill chuck
metal drill bit has a finer point
A titanium or cobalt drill bit.
Use a drill bit that works on brick, drill a hole big enough to hold a metal dowel that will hold the screw that holds the numbers.
The precise shape and angles of a drill bit.
A tungsten coated drill bit.
You need a diamond tipped drill bit to drill glass or tile.
That is a drill bit designed to remove partial drill bits that have broken in a hole
You attach a drill bit into the chuck of the drilling machine.