zero helix angle is used
low helix angle is used
high helix angle is used
any helix angle can be used
plastics
copper
cast steel
carbon steel
high speed steel
stainless steel
either (A) or (B)
drill remover
drill puller
drift
drill drawer
its end tapered for bout three or four threads
its end tapered for about eight or ten threads
full threads for the whole of its length
none of the above
