#12-24 AND #12 SELF DRILLING SELF TAPPING SCREWS. MODIFIED UNDERCUT FLAT HEAD. #3 PHILLIPS FLAT HEAD Use these SELF DRILLING & SELF TAPPING SCREWS TO INSTALL HINGES OR STRIKES IN METAL FRAMES. GREAT FOR STUBBORN ,RUSTED, UNTAPPED OR POORLY TAPPED HINGE AND STRIKE HOLES IN METAL FRAMES. GREAT FOR CONTINUOUS HINGES TOO !!! AVAILABLE FINISHES AND LENGTHS FOR #12-24 SELF DRILLING SELF TAPPING ...STAINLESS STEEL- 5/8", 11/16" LONG AND 3/4" ... NICKEL-5/8" LONG...ZINC 11/16" LONG and 3/4" long. #12 X 1.0" SELF DRILLING SELF TAPPING (STAINLESS STEEL). The MORE you BUY the MORE you SAVE !!