8 x 1 in. Pan Head Tri-Drive Tapping Screws – Steel Zinc – 5000qty
https://nsiindustries.com/product/8-x-1-in-pan-head-tri-drive-tapping-screws-steel-zinc-5000qty/
These pan head tapping screws cut their own threads into a material, but still rquire a pilot hole and are typically used in construction with a variety of materials.