Pozi Double Countersunk Head. 6g = 3.0mm - Pozi 1. 7g = 3.5mm - Pozi 2. 8g = 4.0mm - Pozi 2. 9g = 4.5mm - Pozi 2. The exceptional reliability and strength of the Classic Multi-Purpose Screw enables the user to rely on one product for a variety of applications.