Save time money and labor costs. FlatLOK is a multi-purpose structural wood screw for fastening multi-ply LVL, girder trusses and multi-ply lumber beams. The fastener is designed to eliminate the task of through bolting or nailing multiply of engineered together and can be installed from only 1-side. FlatLOK's can be driven with a traditional TROX 40 bit or the supplied driver bit and zip right in all while meeting code.