Twist drill A standard drill bit with two twisted, fluted cutting edges to remove material Wood Flat drill Has a flat face, a pin at the bottom, and two cutting edges. Allows for a flat blind hole ...

Because cobalt alloy bits are more expensive than conventional metal drill bits, they aren’t economical options for drilling ...

A spade bit is flat, with a sharp point in its center ... These are robust steel drill bits, good for drilling into wood, plastic or metal. One downside: At high drill speeds, they can overheat ...