Metallics JTSF17 Screws 8 X 3/8 Fh Ph TS St-zn (Jar 100)
https://nsiindustries.com/product/8-x-3-8-in-flat-head-phillips-tapping-screws-steel-zinc-100qty/
These flat 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.