18-8 Stainless Steel
Technically, these are sheet metal screws. Somehow we found out that if they are called that, they are much cheaper. Yes, there are differences between "sheet metal screws" and "wood screws" but those differences are minor. Call them "general purpose economy stainless steel screws suitable for wood" and you won't be far off. I have been using them for years, and they hold just fine and don't rust. This is a lot better deal than buying 4 screws in a one dollar package at a big box store.