The WSV is the new improved subfloor screw from Simpson Strong-Tie. The subfloor screws have been re-engineered to reduce driving force and increase installation speed. Less installation torque means reduced wear on tools. WSV screws have a sharp point with an aggressive variable thread resulting in faster, smoother installations. The deep T25 6-lobe recess provides improved control and greater bit life whilst the ribbed head design countersinks easily providing a clean, flush finish.