FastenMaster Headlok 4.5 in. Structural Wood Screw, 12-Count delivers a strong, code-compliant connection in seconds. This heavy-duty structural wood screw requires no predrilling and higher design shear strength than 3/8" lag screws. The flat head fastener installs quickly with a great finished look, making it i for deck framing, stair framing, attaching rigid foam (SIPs), fences, kitchen cabinets, and more. Featuring the SpiderDrive™ System with eight points of contact, it maximizes bit fit and reduces stripping. The sharp gimlet point ensures fast installation into wood and OSB, while the aggressive thread provides excellent holding and withdrawal strength. Each package includes a SpiderDrive™ bit. HeadLOK is tested and supported by engineering data conforming to the latest ICC standards and is for use in ACQ or treated lumber. Model Number: