Simpson Strong-Tie HDU5-SDS2-5 Predeflected Hold Down with ScrewsSimpson strong tie hold down pre deflected body virtually eliminates deflection due to material stretch. Uses SDS screws because it installs easily, reduces fastener slip and provides a greater net section area of the post compared to bolts. 14 Gauge Pre deflected body virtually eliminates deflection due to material stretch Uses SDS screws which install easily, reduces fastener slip, and provides a greater net section area of the post compared to