"Self-Tapping Screw Pozi Compatible Pan Head. Head: Pozi compatible pan head. Finish: Zinc Plated. Pan Head has a flat under head surface which allows the screw to lay flat on sheet material, reducing deformation."
"Machine Screw. Head: Pan head, phillips compatible drive. Finish: Zinc Plated. Pan head has a flat under head surface allowing the screw to lay flat."