Taper Length Drills
Don’t be confused! A straight shank drill the same length as taper shank. Drill America or Qualtech.
High Speed Steel
Not tapered, but longer than jobbers length. The same length as a taper shank drill
hen extra length is needed for heavy duty drilling in stainless steels. 135 degree split point
When extra length is needed for drilling cast iron.
Fast Spiral (HSS)
When extra length is needed for drilling aluminum.