HeadLOK should be installed using a ½" high torque drill (18V Cordless or higher), drive the HeadLOK head flush to the surface. No predrilling required when proper end and edge distances are maintained.
HeadLOK should be installed using an impact driver or high torque 1/2" variable speed drill (minimum 18V if cordless). Choose the proper length fastener so that the threads fully engage the main member (second piece). Bring the washer head flush to wood surface.