Drill bits

A short overview of drill bits and their types

Alloy

Steel

Terrible

HSS

This is the benchmark material for drill bits.

Cobalt steel

Better heat, wear, and lifetime than HSS.

Carbide

Harder and stronger, but expensive and brittle.

Coating

Coatings affect price, corrosion resistance, lifetime, hardness, heat, and chip evacuation.

Black oxide

Inexpensive coating that increases corrosion resistance and life.

Titanium

Multiple types of titanium based coatings exist. They are superior to black oxide but more costly.