Used for stitching metal or attaching to metal. A pre-drilled hole is required. 3 different head types; pan, countersunk and flange head 60 self-tapping thread for ease of insertion AB point Plated in Trivalent Chromium (Cr3) Zinc Manufactured to BS 4174:1972" Gauge: Assorted Length inch: Assorted Thread Dia. mm: Assorted Length mm: Assorted Head Type: Countersunk, Flange, Pan Recess Type: Pozi Point Type: AB Point Driver Bit Size: PZ2 Finish: Zinc & Clear Cr3 Material: Carbon SteelSize 1,305pcs - 1305 Pieces Timco Metal Tapping Screws - Mixed Tray - PZ - Self-Tapping - Zinc in Clear