A pan head combi machine screw is a type of machine screw that combines two different drive types in a single screw head. Typically, a combi screw has both a Phillips and a flat-head drive. This allows for versatility in its use, as it can be driven with either a Phillips or a flat-head screwdriver. Pan head combi machine screws are often used in applications where there may be uncertainty about the type of screwdriver available or where it is desirable to have multiple options for driving the screw.