400 Pack, Teks, #12-14 x 1", Hex Washer Head Drill Point Screws, Provide Secure Metal To Metal Fastening With Strong Holding Power Without The Need To Pre-Drill, Engineered Drill Point & Flute Remove Material Efficiently & Properly Size The Hole For Threads, Ideal For Fastening Thicker Gauge 20-12-Gauge Metal To Metal In Applications Such As Heating, Ventilation & Air Conditioning Attaching Duct Work To Steel Framing, Electrical Attaching Accessories To Steel Framing & Overhead Steel Doors, Hinges, & Latches.