Metallics JTSF30 Screws 10 X 1-1/2 Fh Ph TS St-zn (Jar 100)
https://nsiindustries.com/product/10-x-1-1-2-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.