The Simpson Strong-Tie Strong-Drive SDS Heavy-Duty Connector screw is a 1/4"-diameter high-strength structural wood screw ideal for various connector installations as well as wood-to-wood applications. It installs with no predrilling and has been extensively tested in various applications. The SDS is improved with a patented easy driving 4CUT™ tip and a corrosion-resistant double-barrier coating. • Patented 4CUT tip enables easy driving with no predrilling and minimal wood splitting • Available with a double-barrier coating • 3/8" hex head with 0.48" integrated washer • Head is stamped with the Simpson Strong-Tie sign and fastener length for easy identification after installation • Replacement driver bit — BITHEXR38-134