B-Line Eaton series runway support, Used to support cable runway from objects, 4" runway support, ASTM A36 structural steel, Yellow zinc

It is a 4 inch runway support, so it is sized to the 4 inch dimension of the runway it carries. Overall the bracket measures 4 x 27.75 x 24 inches, which is the envelope you need to clear in the ceiling space or along the wall where it mounts.

It supports cable runway from an object, meaning the runway hangs off or braces against an existing structure such as a wall, column, or ceiling member rather than being free-standing. It is a structural bracket only, not a runway section and not a threaded rod kit.

The bracket is ASTM A36 structural steel with a yellow zinc plating. A36 is the common hot-rolled structural carbon steel grade, so this is a load-carrying steel part, not extruded aluminum. Yellow zinc is a plated finish suited to dry interior spaces like equipment rooms and telecom closets; it is not a hot-dip galvanized or painted exterior coating.

Yes, the runway support is UL Listed, which is the listing most electrical inspectors and institutional specs look for on cable support hardware in an equipment room.

What ships is the runway support bracket itself. Anchors, bolts, or concrete fasteners appropriate to the wall, column, or structure you are attaching to are a separate line item, and the runway-to-bracket hardware is specified with the runway system you are using.

2.8 pounds per bracket. That is a one-hand piece on a ladder, so the real constraint is the anchors into whatever structure you are attaching to, not handling the support itself.