Product Description ------------------- These sheet metal screws, or tapping screws, are highly versatile and are used to attached metal, wood, fiberglass and plastic. The sharp threads draw material together and ensure a secure hold. Sheet metal screws are fully threaded with a sharp point. From the Manufacturer --------------------- These sheet metal screws, or tapping screws, are highly versatile and are used to attached metal, wood, fiberglass, and plastic. The sharp threads draw material together and ensure a secure hold. Sheet metal screws are fully threaded with a sharp point.