1/4"-20 x 3-1/2 Phillips Drive, Countersunk Head Tek 4 Self-Drilling Screw with Wings, Steel WAR Coated (Box of 800)

• W.A.R. COATED - for use in pressure treated lumber and other highly corrosive environments. These screws exceed 1000/hrs of salt spray resistance.
• WINGS - allow screw to ream through wood before the screw reaches metal, preventing jacking action and providing smooth installation all the way through. Wings as they come into contact with metal.
• TEK 4 DRILL POINT - gives screw a drill capacity of .110" - .375" through metal. Recommended Drill Speed is 1350 RPM.
• DEEP CHIP CAVITY - allows screws to cut threads more effectively into metal.
• ATTACHES WOOD to METAL (3/4" - 2-1/2" Wood Thickness to .110" - .375" Metal Thickness)