Simpson Structural Screws SDS25312SS-R25 1/4-Inch by 3-1/2-Inch with 2-1/4-Inch threaded Structural Wood Screw, 25-Pack 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