Metallics JRM130 Screws 3/8-16 X 3 Rh Cd MS St-zn (Jar 50)
https://nsiindustries.com/product/3-8-16-x-3-in-round-head-combo-machine-screws-steel-zinc-50qty/
These screws have finer threads than typical screws, requiring a pre-drilled hole and are perfect for joining metal parts in machinery and construction. With a combo drive, these fasteners can be used with slotted and Phillips screwdrivers and drill bits.