Hesheng also offers a wide range of components and fittings of cable trays. The Strengthening slotted or plain or back to back Bracket STNB1 is one of the fittings, which is attached to a wall and used to support or hold up cable or electric wire supporting system. Trays can be suspended either in the ceiling, in a raised floor, or mounted along walls with optional kits or brackets.Strut channel is 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. 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. Punched channel has round holes, large enough for 5/8 inch threaded steel rod or bolts, punched in the top of the channel at regular 1 7/8 inch centers. Half-slot channel has short, rounded end rectangular slots punched out on 2 inch centers. Slot channel has longer slots on 4 inch centers. H .S. Strut Channel is the original metal framing system featuring a unique weldless connection. The H .S. Channel Strut or C channel or U type channel system eliminates welding and drilling, and is easily adjustable and reusable for infinite configurations.