Made of cast stainless steel, American Standard No. CF-8, with matte, shot-blast finish, DIN 6336-NI Hand Knobs are available blank, with threaded blind bores, or with tapped through bores. Inch size threads range from 1/4-20 to 1/2-13, while with metric threads range from M6 x 1.0 to M12 x 1.75. Special inch or metric bores, threads, and drilled and pinned threaded studs are available upon request.