OZCO Ornamental Wood Ties (OWT) Truss Base Fan 12: 12 plates are designed for use with pressure treated lumber and are engineered to make installation faster and easier. All products in the OWT line are constructed for indoor and outdoor use and can stand up to summer's harshest conditions; sun, wind, and rain are no match for the ultra-heavy gauge steel and corrosion protection. OWT utilizes industry-leading features and attachment techniques, making them truly a building breakthrough.