Flat heads are countersunk (cone shaped under the head) with a flat top. Slotted drive has a simple slot for a flat bladed screw driver.
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Round heads are domed and look like half of a sphere. Slotted drive has a simple slot for a flat bladed screw driver.
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Bits for slotted screws.
Screws with machine threads for use with a nut or in a tapped hole.
Screws with an Allen wrench drive.