●VERTICAL APPLICATION: hangs threaded rod to all your overhead wood structures ●BETTER CHOICE: more economical and time efficient than traditional methods ●SPECIFICATIONS: Screw Length 2 1/2 in. / Screw Diameter 3/8 in. / Rod Fitting Diameter 3/8 in. ●DURABLE: galvanized steel structure with zinc coating, for ultimate quality and corrosion resistance ●FAIL-PROOF: use Sammys #14 Black Nut Driver #8113910 to reduce over-torque and prevent screw failure. No pre-drilling required!