Hoffman CMC20, Mtg Channels, Qty 2, Fits 20.00, Steel/ZincMounting Channels provide mounting framework for installing DIN rails and grid straps at various positions within the enclosure. Channels can be mounted vertically or horizontally to collar studs or to the slide mechanisms of the adjustable-depth mounting kit. Kit includes two channels. . Product Specifications BRANDHoffman® MANUFACTURERS PART NUMBERCMC20 CONSTRUCTIONSteel DESCRIPTIONMounting Channels COLORZinc QTY. PER KIT2 FITS20 FITS CONCEPT ENCLOSUREWhen A or B = 20.00 in. (508 mm)