HOLE BORING TOOLS

[Willibrod]

There is a manual tool for cutting holes in large-ish holes, say 6inches dia, in e.g. metal, brick . A version of this, is used in surgery for cutting holes in skulls, called trepanning. The device was used in the film Rififi (1950?) for cutting a hole in the back of a bank safe.  What is the device called in the engineering field?

[scottg]

You want to know about a hollow tube that cuts out a "slug" right?
Its called a burr in medicine.
In wood or soft metal its a holesaw.
Carbon steel is for wood only, and high speed steel (bimetal) cuts metal.
  For tile it has or be carbide teeth or diamond coated, but they often still call the small ones holesaws for some reason. 

In stone or concrete it has to be diamond coated, and its a core drill.

Holesaw and core drill are often interchanged in common slang.
  yours Scott

[William Keppler]

Scottg.  Thanks for the info. Much obliged, very useful.
Willibrod

[Billman49]

I have a set from the UK (pre WW2)used to cut holes in water tanks (called tank cutters) rather than saw teeth, they have teeth like a milling cutter - they were used in a hand brace, must have been hard work with a 4inch diameter one....