Metallics JPFMMV2231100 Hangermate 1/4-20 X 1 Vertical Steel (Jar 25)

It's the vertical version, meaning it is driven up into a horizontal surface such as a deck or joist bottom so the threaded rod hangs straight down. If your anchor point is a wall or other vertical surface and you need the rod to come out horizontally, you need a horizontal-style Hangermate instead, not this one.

They ship 25 to a jar. That's the packaged quantity for JPFMMV2231100, so a single order unit covers 25 hanger points, which is usually enough for a run of conduit or small-diameter pipe on one floor.

It's a threaded-rod anchor point. You drive the Hangermate into the structure overhead, then thread 1/4-20 rod into it to suspend conduit, strut, cable tray, or small pipe. Metallics catalogs it as electrical hanger hardware, and the 1/4-20 size is the light-duty end of the range used for single conduit runs and small supports rather than heavy trapeze assemblies.

Steel. It's a steel-bodied vertical Hangermate with 1/4-20 threading, so it's intended for dry interior hanging work rather than wet or corrosive exposure where stainless would be specified.