Used for stitching metal or attaching to metal. A pre-drilled hole is required. Countersunk head gives a discreet finish into pre-countersunk holes Plated in Trivalent Chromium (Cr3) Zinc 60 self-tapping thread for ease of insertion Manufactured to BS 4174:1972" Gauge: 8 Length inch: 3/4 Thread Dia. mm: 4.2 Length mm: 19 Head Type: Countersunk Recess Type: Pozi Point Type: AB Point Driver Bit Size: PZ2 Finish: Zinc & Clear Cr3 Material: Carbon SteelSize 8 x 3/4 - 200 Pieces Timco Self-Tapping Screws - PZ - Countersunk - Zinc in Silver