Fine thread bugle head drywall screw and coarse thread drywall screw 
Sharp Point means quick easy penetration into light gauge metal wood 
Diameter: 
3.5mm(#6), 3.9mm(#7), 4.2mm(#8), 4.8mm(#10) 
Length: 
From 16mm to 152mm From 1/2" to 6" 
Coating: 
Black Phosphated, Grey Phosphated, Zinc, Yellow Zinc, Decromet