Hexagon Self Tapping Screws Length: 20--150mm Dia: 3.5--6.3mm (6#--14#) Surface: galvanized. Hexagon Self Tapping Screws Galvanized ... Hexagon Self Tapping Screws 1. Surface treatment: Plain, zinc plated,black ... , yellow zinc plated etc.2. Main Feature: With tapping point, hexagon head, coarse/fine Thread.3. Thread : ...