Simpson Strong-Tie® Strong-Drive structural fasteners are engineered and extensively tested to meet the needs of the most demanding wood-to-metal applications. The Strong-Drive TB Wood-to-Steel screw is a structural fastener used for fastening wood to steel (maximum recommended thicknesses: up to 1/4 in.). This wood-to-steel screw features a flat head with nibs for easy countersinking. The screw is designed for use in dry, interior or noncorrosive environments only. Strong-Drive® TB WOOD-TO-STEEL Screw — #14 x 2-3/8 in. #3 SQ, Black Phos. (1000-Qty) (Pack of 64).