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 2015 and 2018 IRC® and IBC® code requirements for several common wood framing applications. Key Features SawTooth™ point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications Bold thread design provides superior holding power Underhead nibs offer greater control when seating the head Large low-profile washer head provides maximum bearing area (0.75" head dia.) Size identification on all SDWS screw heads 6-lobe T40 drive provides positive engagement that makes the screw easy to drive and improves bit life (replacement driver bit — BIT40T-134-RC)