Used to Fabricate Custom Size Cases, Cabinets and Pass-Through Assemblies Mounts On the Surface 12' (3.66 m) Stock Lengths This CRL Surface Mount Double Channel Extrusion has a 1 inch (25.4 millimeter) high leg on one side for mounting to the wall, and is designed to project out from the wall 1.182 inch (30.02 millimeter). If the corners ...