Simpson Strong-Tie offers a variety of fasteners styles designed specifically for every project type to help you design and build safer, stronger structures. Our metal-panel screw with EPDM washer is designed to fasten aluminum agricultural siding panels to wood joists without pre-drilling. To withstand the most corrosive environments, these screws are Type 316 stainless steel. Metal-Panel Screw with EPDM Washer — #9 x 1-1/2 in. Hex Head, Type 316 (5-Qty) (Pack of 3240).