The TrussLOK® Engineered Wood Fastener is designed for joining multi-ply LVL, LSL and PSL. This fastener was developed with direct input from a leader in engineered wood, Trus Joist®. TrussLOK® is faster, easier and stronger than through-bolts and other structural self-drilling fasteners with similar diameters. TrussLOK® is approved for single-sided installation unlike nails and other screws of similar diameter that need to be installed from both sides. #14 diameter shank.OMG Inc.