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 Twist bits are most common and have a sharp point and two spiral-shaped cutting edges that lift chips out of the hole as they turn.
They can be used on soft wood and wallboard.
For drilling through harder woods and soft metals, choose a high-speed drill bit that won't dull as quickly during repeated use. |
 Spaded or flat wood bits are used for drilling holes in wood up to 1/2-inch in diameter.
The ends of the wood bit have a flat blade studded with a pilot for precise positioning.
Some contain sharp outer spurs that score the wood to prevent splintering. |
Masonry & glass bits are tipped on the cutting edges with carbide so they remain extra sharp after continuous use.
Because of this, these bits are good to use for drilling holes in concrete, brick and tile. |
Titanium bits are ultimately a stronger bit than most because of numerous deposited coatings |
Cobalt bits are made from exceptionally hard and heat-resistant steel so they tend to be stronger than high-speed steel. |
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Drill Bits.
