Sheet metal screws are used for a wide variety of applications, usually fastening one metal part to another and are also commonly used in wood. Also called "self-tapping" screws, slotted oval head sheet metal screws feature a countersunk head to sit in a recessed hole and a rounded top of the head as well as an indented slotted drive. Made from 18-8(304) stainless steel for excellent resistance to corrosion.