TEKS #12 X 3/4 IN. ZINC-PLATED STEEL HEX-WASHER-HEAD SELF-TAPPING SCREWS ARE PERFECT FOR ATTACHING THICK-GAUGE METAL TO METAL IN HVAC, ELECTRICAL AND OVERHEAD STEEL DOOR APPLICATIONS. THE SCREWS OFFER A HIGH HOLDING POWER. INSTALLS WITH A STANDARD SCREW AND A 3/16 IN. HEX DRIVE BIT (INSTALLATION MATERIALS ARE NOT INCLUDED)