B-Line Eaton series strut back-to-back welded channel, .81" channel height, 240" channel length, 1.62" channel width, Steel, 14 Gauge, B54 channel typ

Neither. The finish is Plain, meaning bare, uncoated steel. That is fine for dry indoor mechanical and electrical rooms, but for damp locations, exterior runs, or anywhere washdown occurs you want a coated or galvanized channel instead, since plain steel will surface rust.

The B54A uses B-Line's B54 channel type, a 1-5/8 inch wide profile at 1.62 inches with a .81 inch height, which is the shallow (half height) version of the standard 1-5/8 strut family. Hardware sized for 1-5/8 inch wide channel slots engages it. What you should check is depth: fittings and nuts specified for the full 1-5/8 inch deep channel can be too tall for a .81 inch deep section.

Two shallow channels are welded back to back so you get a slot facing out on both sides of the same piece. Use it where you need to hang or brace from both faces of one run, such as a trapeze with supports off each side or a double-sided rack. If you only ever fasten from one face, a single channel is the simpler buy.

Order Eaton B-Line part number B54A-240 PLN. The 240 is the 240 inch length and PLN is the plain, uncoated finish.

Yes. It is 14 gauge plain steel with no coating to protect, so it cuts with a bandsaw, chop saw with a metal blade, or portaband. Since the finish is bare steel to begin with, cut ends do not break a galvanized coating, but they should still be deburred before anything is slid over them.