Profile: CMI Corporation offers pulleys & trolleys, harnesses, webbing products, descenders, rigging hardware, asenders, ropes & accessories and carabiners. Rigging hardware includes rig plates, resue swivel and bolt hanger. Our ascender bodies are extruded from aircraft grade aluminum and stainless steel. The aluminum bodies are finished with a hard powder coat to permanently protect them from the elements. All of our ascenders easily accomodate 5/8 inches ropes.