TechLine Mfg. Perforated Channel is designed to be a tubing and cable support system which utilizes bolt together fittings to route tubing or cable runs in an industrial application. TechLine Mfg. Channel is available as UL Classified upon request. The standard length of TechLine Mfg. channel is 20ft. The standard material finishes available are Hot Dipped Galvanized, Aluminum, and 304 Stainless Steel.