14 Gauge Strut Channel with Knock-Outs PS 210 KO6 (knock-out) is design for use in electrical raceway and support applications, and is UL listed and CSA listed for use as a strut-type channel raceway. The knock-outs are supplied attached to the strut and can be punched out in the field, as needed, for entry and exit of the wiring from the channel raceway. This product is commonly used for lighting and other electrical applications. The channel can be used as both the raceway and support for the lighting, minimizing the material needs on the project and providing a clean, aesthetically pleasing installation.