The Simpson Strong-Drive® screw is a 1/4" diameter structural wood screw ideal for various connector installations as well as wood-to-wood applications. It installs with no pre-drilling. The patented 4cut™ tip has a square core and serrated threads to reduce installation torque, making driving easier with minimal wood splitting. A new double barrier coating finish provides corrosion resistance superior to hot dip galvanization. Perfect for indoor and outdoor use and certain pressure-treated wood applications. Available in 1/4" diameter with a 3/8" hex washer head with lengths ranging from 1 1/2" to 6”. Best when used with a low speed 1/2" drill and a 3/8" hex driver.