... ,Zinc,Yellow Zinc,Packing: Rugular Drywall Screws Coarse Thread Diameter: 3.5mm(#6),3.9mm(#7),4. ... Phosphated,Zinc,Yellow Zinc,Packing: Rugular Collated Screws Screw Types: Drywall Screw, Chipboard Screw, Subfloor Screws, and Decking ScrewHead Types: ... )Thread: Fine or Coarse Thread.Point: Sharp Point, Self-drilling Point.Coating: Black or Gray Phosphated, Zinc Plated, Decromet, Ruspert,Screw Guns ...