Key Features: Designed to provide an easy-to-install, high-strength alternative to through-bolting and traditional lag screws. The Strong-Drive SDWS Timber screw is ideal for the contractor and do-it-yourselfer alike. It is code listed under IAPMO UES ER-192 and meets 2012 and 2015 IRC® and IBC® code requirements for several common wood framing and engineered-wood applications. Strong-Drive® SDWS TIMBER Screw 0.276 in. x 4 in. T-50, Type 316 (Pack of 40).