A step bit is an angled bit which can drill several different diameter holes, depending on how deep you push it. Electricians use them often for drilling into panels. You can find them in the electrical section at your closest building store. Expect to pay 30 to $50 for a good one.
Almost any place that has drill bits should have a countersink bit. Drills a pilot hole and the tapered countersink in one step.
metal drill bit has a finer point
A titanium or cobalt drill bit.
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 can drill holes in aluminum with a drill as long as you have the proper drill bit. Use a regular drill bit and keep speed moderate.
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You attach a drill bit into the chuck of the drilling machine.
That size is 8-32. The drill bit for a clearance hole is 11/64, or a #17 drill bit.
Surprisingly enough- a 6 mm drill bit, or if you don't have one,1/4 drill bit will do.