... addition to eliminating some clamping, the creative use of drywall screws can many times eliminate the need for complicated, time ... Black Phosphated,Grey Phosphated,Zinc,Yellow Zinc,Packing: Rugular Drywall Screws Coarse Thread Diameter: 3.5mm(#6),3.9mm(#7),4 ... 1/4 )Thread: Fine or Coarse Thread.Point: Sharp Point, Self-drilling Point.Coating: Black or Gray Phosphated, Zinc Plated, Decromet, Ruspert ...