You can never have too many drill bits because
they tend to wear out with use and must be
sharp in order to drill smoothly. Fortunately,
the same bits can be used for a hand drill,
a power drill, and a drill press. The variations, other
than size, are primarily in the composition
and the intended material to be drilled.
The other difference is in style: a twist
bit (looks like a candy cane) or a spade
bit. (flat with a point on the end).
Twist bits can be used on wood, metal, plastics
and other soft materials. The most frequent
complaint of twist bits is that the smaller
diameters sizes break easily, so use care
not to apply any diagonal force to the bit
Carbon steel bits are designed for drilling
wood, so don't use them on metal. High speed
steel bits, on the other hand, are god for
drilling most types of material. A third
variety, Titanium coated bits (they are gold
in color) is especially designed for drilling
metal because the coating hardens the bit
and provides a small measure of self-lubrication.
Use a masonry bit for drilling
stone, quarry tiles or concrete.
tip is made from tungsten carbide
to a spiralled steel shaft. When
masonry bit, use a slow speed
that you don't overheat the tip.
Other bits are available for
and glass, dowels, large holes,
flat bottoms, and for countersinking
See your retailer or search through
on the right for more details
on these specialty