For use on exterior of all types including decking and fencing. Rust proof but not corrosion resistant. Zinc plated coating. Diamond tip provides self-threading, maximum holding power for cable tie strips, furring, junction boxes, expansion joints, wall partitions, stud track, window/door frames, duct insulation/strap hangers, gutters, framing, shelves, cabinets and signs Highlights: Box of 100 No. 12 Diameter 1" Length Zinc Plated Pan Head - Phillips