The rigid shaft couplings are completely interchangeable to other industry standard rigid couplings. Guardian offers these as a rigid single piece set screw clamp design, a one-piece single split clamp design, and a two-piece double split clamp design. Most designs are available in steel, stainless steel, and aluminum. The steel designs come with either a plain, black oxide, or zinc finish. They are offered in a variety of bore and keyways sizes, including metric bores and keyways.