Hesheng also offers a wide range of components and fittings of cable trays. Concrete Insert Channel is one of the fittings. Basic strut channel comes in the open box section, 1 5/8 by 1 5/8 inch square cross section. Several variations are available with different hole patterns for mounting to walls and supports. Solid channel has no holes predrilled, and must either be drilled on site or mounted in another fashion. In addition, shapes are manufactured with two lengths of channel welded together back to back, or three or four welded together in various patterns, to form stronger structural elements. Strut is normally made of sheet steel, with a zinc coating, paint, epoxy, powder coat, or other finish. Strut channel is also manufactured from stainless steel for use where rusting might become a problem e.g., outdoors, facilities with corrosive materials, from aluminium alloy when weight is an issue or from fiberglass for very corrosive environments. H .S.Strut Channel is the original metal framing system featuring a unique weld-less connection. The H .S. Strut Channel system eliminates welding and drilling, and is easily adjustable and reusable for infinite configurations.