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 applications. • Bold thread design provides superior holding power • Patented 4CUT™ tip ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications • Under-head nibs offer greater control when seating the head • Large washer head provides maximum bearing area (0.75" head dia.) • Size identification on all SDWS screw heads • 6-lobe T-40 drive reduces driver-bit cam-outs, resulting in easier installations and longer bit life • Double-barrier coating provides corrosion resistance equivalent to hot-dip galvanization, making it suitable for certain exterior and preservative-treated wood applications.