Metallics JTS32181SSD Anchors 500 3/8 x 2-1/4 Wdg SS (Jar 100)

That's the common use for this length. A 3/8 x 2-1/4 wedge anchor gives you roughly an inch and a half of embedment after the thickness of a strut or clamp base and the nut, so it suits unistrut, trapeze hangers, conduit straps, and panel and disconnect mounting on poured concrete. It is a solid-concrete anchor, not for hollow block cells, brick, or drywall.

Stainless steel, which is why it gets specified where a zinc-plated wedge anchor would rust out: exterior equipment pads, parking structures, pump rooms, car washes, coastal work. For dry interior slab work a plated carbon steel wedge anchor of the same 3/8 x 2-1/4 size does the same mechanical job.

Order Metallics JTS32181SSD. That one number covers the 3/8 x 2-1/4 stainless wedge anchor in the 100 piece jar, and it is the only configuration under it, so there's no length or finish option to specify.

100 pieces, packed in a jar rather than a box, which keeps the threads from getting chewed up rattling around a gang box. One jar covers 25 four-hole bases.

No. A wedge anchor is a one-shot mechanical anchor: torquing the nut expands a clip against the hole wall and it will not come back out. If the fixture has to come off later you back off the nut and leave the body in the slab, then cut or grind the stud flush. If you need something removable, use a threaded insert or a female-type anchor instead.