Available here are Pozi Flange head self tapping screws in a Black zinc phosphate coated. Features include:

Type AB sharp point.
Case hardened to prevent shearing under load.
60°self tapping thread for ease of insertion.
Manufactured to BS4174.

Screw specifications are as follows;

6g (No.6) = Thread Diameter = 3.5mm; Head Diameter = 8mm; Head Height = 1.9mm.

8g (No.8) = Thread Diameter = 4.2mm; Head Diameter = 10mm; Head Height = 3mm.

10g (No.10) = Thread Diameter = 4.8mm; Head Diameter = 11.5mm; Head Height = 3.5mm.

Screw lengths do not include the head.