Dayton Audio 6-1/2"x12" Waveguide Quick Overview The Dayton Audio H6512 high frequency waveguide is precision molded from durable ABS plastic, and has an industry-standard 1-3/8" x 18 TPI throat for mounting screw-on style drivers. Product Highlights - Uncolored, natural sound - Durable ABS plastic construction, metal threaded throat - Standard 1-3/8" x 18 TPI mounting for screw-on drivers - Even, consistent coverage pattern - Great for PA, stage monitors, or any demanding application