Simpson Strong-Tie® Strong-Drive® SDS Connector Screw, 1/4 in Thread, Hex Drive, 3/8 in Drive, Hex Head, 2-1/4 in Thread Length, 3-1/2 in Overall Length, Finish: Double Barrier-Coated, Additional Information: 3/8 in Dia Head, 0.235 in Dia Shank, Type 17 Point, Heavy-Duty