A light duty metal to metal screw with a phillips recess used for interior applications. Fire Classification: A1" Thread Dia. mm: 3.5 Length mm: 25 Head Type: Pan Recess Type: Phillips Point Type: Self-Drilling Driver Bit Size: PH2 Finish: Zinc Material: Carbon Steel Max Drilling Thickness mm: 2.5Size 6 x 1 - 1000 Pieces Timco Metal Construction Sheet & Stud Screws - PH - Pan - Self-Drilling in Silver