The round screw head is the domed-one some members believe sits too high. That is why I suggested the Pan Head, it has a lower profile- but is not completely round but has a flat top (to aid in a non-slip drive ability). There is a third head which I rejected which is the Truss Head. It has a lower round head but it is also has a wider profile so I do not believe it fits in this case. Just to be complete you would want a "M4 slotted ANSI Pan head screw". Many pan heads use a Phillips (X) driver, and a JIS (Japanese Industrial Standard) Pan Head has a smaller head.