These 3 3/4" length #3 Phillips drive Flat Head ZINC PLATED Self-Drilling screws with WINGS are 1/4" diameter (20 threads per inch) #4 Point. Zinc plated is a plating that is applied electrically to fasteners that prevents oxidation of steel by forming a protective barrier. Reaming type WINGS are attached after the threads and before the drill point to ream out the top material, eliminating any jacking action. Meets F.I.P.-1000.7 for torsional strength and drill speed. Zinc plating meets ASTM B-117 for salt spray corrosion. Each box contains approximately 500 screws (20 pounds)

These 3 3/4" length #3 Phillips drive Flat Head ZINC PLATED Self-Drilling screws with WINGS are 1/4" diameter (20 threads per inch) #4 Point. Zinc plated is a plating that is applied electrically to fasteners that prevents oxidation of steel by forming a protective barrier. Reaming type WINGS are attached after the threads and before the drill point to ream out the top material, eliminating any jacking action. Meets F.I.P.-1000.7 for torsional strength and drill speed. Zinc plating meets ASTM B-117 for salt spray corrosion. Each box contains approximately 500 screws (20 pounds)