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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Round heads are domed and look like half of a sphere. Combination drive can be used with either a flat bladed or Phillips screw driver.
Round heads are domed and look like half of a sphere. One way drive is installed with a flat bladed screw driver but cannot be removed without special tools.
Screws with machine threads for use with a nut or in a tapped hole.
Screws with an Allen wrench drive.