Simpson Structural Screws SDS25600-R10 Threaded Structural Wood Screw, 1/4-Inch by 6-Inch with 3-1/4-Inch 3/8-Inch hex head Patented 4-Cut point and type 17 point enables easy driving without pre-drilling and minimalm splitting Head is stamped with Simpson Strong Tie Stamp and fastener length for easy identification Low speed 1/2-Inch drill with 3/8-Inch hex driver recommended for installation Meets ICC-ES ESR-2236 codes