... and etc.2. by head typesFlat, Oval, Binding, Pan, Round, Truss, Button, PF, Pan washer, Cheese, Countersunk, Fillister, hexagon, ... , Hexagon socket button head and etc.3. by type of drive insertsPhillilps, Slotted, Pillips/slotted combination, Cross recess ... type, H drive, Hexagon socket, Square socket, Torx, Triangle drive ...