The materials from which bits are manufactured play a big role
in the life and performance of the bit. A spade drill bit for metal is a two part bit with a tool holder and an insertable tip,
called an insert. Ideal for drilling in hard-to-reach areas and for running wires and cable. Northern Industrial Tools (Steel) Drill Bits � 1/16in. Hardened steel is a term for high or medium
carbon steel that received quenching treatments and then had ample tempering. Amazing deals on this 3 piece titanium nitride coated high speed steel step drills
& other step drill bits at Harbor Freight. Metric and SAE drill bit sets for drilling steel. See more detail at http://drill.bit.for.steel.bestcheaphanddrills.com
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