No.4; thread diameter 2.9mm; head diameter 5.5mm.
No.6; thread diameter 3.5mm; head diameter 6.8mm.
No.8; thread diameter 4.2mm; head diameter 8.1mm.
No.10; thread diameter 4.8mm; head diameter 9.5mm.
No.12; thread diameter 5.5mm; head diameter 10.8mm.