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FastenMaster TimberLOK is a hex head heavy duty wood screw available in a variety of lengths and packaging sizes for applications such as attaching rafter or trusses to the top plate headers stair stringers and more. Designed to replace traditional 3/8 inch lag bolts TimberLOK installs in a fraction of the time with fewer steps and less effort. Its sharp point and aggressive threads zip right into the densest woods. TimberLOK is tested and supported by engineering data that conforms to the most current ICC standards. It is also approved for use in ACQ or treated lumber. In 1998 TimberLOK pioneered the category of structural wood-to-wood screws. Since then TimberLOK and the rest of FastenMaster’s LOK Line have been trusted by PROs everywhere.