The Avid Titanium Flutton Screws are designed to do it all (flat, button, or socket head). The ultra-low profile head is 1mm thick and chamfered so it will self-center in those countersunk areas like the bottom of your chassis as a flat head screw. The base of the screw head is flat so it can also be used as a button/socket head screw. Last but not least, it features a 1mm shoulder at the base of the threads that allows the screw to self-center and sit snug in areas such as a top deck.