B-Line 4D22S-120SS4 Eaton series 4Dimension strut channel

It is steel with a Type 304 stainless steel finish, which is what the SS4 suffix on 4D22S-120SS4 indicates. That makes it the right choice for wash-down areas, food service, coastal or exterior runs, and wet mechanical rooms where pre-galvanized or painted strut would rust out. For dry indoor electrical work, a pre-galvanized channel is the cheaper spec.

Fittings have to match the 4D22 profile. This is a 2.12 by 2.12 inch square section in the 4Dimension series, not the common 1-5/8 inch single channel, so channel nuts, end caps, and clamps sized for 1-5/8 strut will not seat correctly in the slot. Order nuts, spring nuts, and connecting hardware called out for the 4Dimension 4D22 profile, and match them in Type 304 stainless if the run is in a corrosive or wet location so you are not mixing carbon steel hardware with stainless channel.

The S designates the slotted hole pattern on the 4D22 channel profile. Slotted strut lets you slide channel nuts, beam clamps, and pipe clamps anywhere along the run and gives adjustment when you are aligning conduit or trapeze hangers, rather than forcing you onto fixed punch locations. If you need a solid back with no holes, that is a different suffix in the 4D22 family.

Yes. The manufacturer part number is 4D22S-120SS4, which breaks down as the 4Dimension 4D22 square channel profile, S slotted hole pattern, 120 inch length, and SS4 for Type 304 stainless. Quote that full number when you order, since changing any one of those segments gets you a different channel.

Yes, 18 gauge stainless channel cuts on site with a bandsaw, chop saw with a metal blade, or portable band saw, and the 120 inch stick is meant to be cut down to hanger lengths. Two things to watch on Type 304: use a blade or wheel that has not been used on carbon steel to avoid embedding iron particles that will rust, and dress and protect the cut end, because the bare cut edge no longer has the corrosion resistance of the mill surface.