These are the very small screws which you'll see on certain pickup surrounds, back plates etc - very similar to a pickguard screw really, and for some applications, they're used for that purpose.

One point of interest, is the completely flat head - a true "counter sunk" screw, as opposed to the "raised countersunk" you'll normally see.

Quantity - 1
Weight - 2g
Material - Steel
Thread - 2.5mm x 12mm (3/4 Thread - Actual thread Length - 9mm)
Head - Countersunk/Flat
Head Diameter - 4.6mm
Total Length - 14mm