B-Line Eaton series data and low support fasteners, BCHK3 includes: 1 each BCHK1 Kit and BCHK2 Kit, Beam clamp and angle bracket, Steel

BCHK3 is a combination pack: one BCHK1 kit and one BCHK2 kit in a single part number. Between them you get the beam clamp and angle bracket hardware used to hang datacomm and low voltage pathways. Ordering BCHK3 instead of the two kits separately means one line item and one MPN to track.

Steel. The BCHK3 beam clamp and angle bracket hardware is a steel fastener kit, so it is the right choice where a plastic or composite hanger would not take the load or would not be accepted on a commercial low voltage pathway install.

A beam clamp is what you use when you are attaching to existing structural steel and you do not want to drill or weld it, which is usually a non-starter on an occupied commercial building. The BCHK3 pairs that clamp with an angle bracket so you can turn the attachment point and pick up a low voltage support at the angle you need. If your attachment surface is concrete deck rather than steel, a beam clamp is the wrong fastener and you want a concrete anchor instead.

It is part of Eaton B-Line's datacomm and low voltage support fastener line, so the intended use is data cabling and other low voltage pathway support rather than heavy power conduit racking. For a structured cabling or security system rough-in off overhead steel, that is the correct family to be specifying from.