Shorpioen 255-Pack 6-18 x 1 1/2 Phillips Bugle Head Fine Thread Drywall Screw Black Phosphate BC-0624YPG
Fine thread Drywall--Sharp point: For attaching drywall to metal studs from 25 gage through 20 gage thick. Longer sizes are ideal for multiple layers or insulation. Fine thread Drywall--Drill point: Will drive easily through drywall, drill a hole in a steel stud up to 14 gage thick, and form its own mating thread. Can also be used for attaching plywood or insulation board to 14 gage metal.
Screws shall be quenched in liquid and then tempered by reheating to 650°F minimum.