#6 x 31mm (1-1/4'')..Flat head Csunk Zn Pl screw thread Lo-Root.
This is the most common screw style; it is used for general work and has the widest range of sizes. It is the bread and butter line of screws and allows the screw to be sunk into the timber or fitting for a flat surface.
Finish is clear Zinc plating; ideal for matching hardware hinges gate fittings etc. It is moderately corrosion resistant, but the finish is primarily decorative.
#1 is the driver bit size for #6 gauge screws.
This is a Green colour coded bit or hand driver.