TrussLOK-Z® is a structural wood screw engineered for joining two-, three- and four-ply girder trusses. TrussLOK-Z requires no predrilling and is engineered for single-sided installation. The thread length is correct for dimensional lumber, eliminating board jacking and pulling trusses together during installation. TrussLOK-Z can also be used with 1 1⁄2" thick LSL and LVL truss chords. It features a hex head drive system and a free hex bit is included in every box.