TEKS SELF-TAPPING SCREWS PROVIDE SECURE METAL-TO-METAL FASTENING WITH STRONG HOLDING POWER WITHOUT THE NEED TO PRE-DRILL. ENGINEERED DRILL-POINT AND FLUTE REMOVE MATERIAL EFFICIENTLY AND PROPERLY SIZE THE HOLE FOR THREADS. IDEAL FOR FASTENING THICKER GAUGE (20-12 GAUGE) METAL TO METAL IN APPLICATIONS SUCH AS HEATING, VENTILATION, AND AIR CONDITIONING (ATTACHING DUCT WORK TO STEEL FRAMING), ELECTRICAL (ATTACHING ACCESSORIES TO STEEL FRAMING), AND OVERHEAD STEEL DOORS, HINGES, AND LATCHES. INSTALLS WITH A STANDARD SCREWGUN AND A 5/16 IN. HEX DRIVE BIT.