The Hillman Group 590250 Flat Head Phillips Sheet Metal Screw, #6 by 1/2-Inch, Zinc, 22pcs/Card Sheet metal screws are highly versatile, used in wood, fiberglass and metal, also called self-tapping screws Pan head screws contain a slightly rounded head with short, vertical sides and a lower profile than similar round styles A phillips drive reduces the risk of over-tightening in order to protect the screw and fastened material Pre-drilling is recommended 22Pc per pack