These screws need a jeweler's screwdriver or similar - round Phillips head. Metric dimensions are nominal and specified as Overall Length x Shank Diameter Under Head x Head Diameter. See below for size and gauge code.
Tapered Drill Adjustable Drill Countersink Counterbore, 7-Piece Set
A tapered HSS drill is the gold standard for seating tapered screws such as traditional brass or silicon bronze screws in boatbuilding. These screws, which have some plain shank...