B-Line Eaton series strut channel, 2.43" channel height, 120" channel length, 1.62" channel width, Aluminum, 12 Gauge, SH hole pattern, B12 channel ty

SH is B-Line's slotted hole pattern in the back of the channel, as opposed to plain (unpunched) back. The slots let you bolt the channel straight to structure, or run threaded rod and bolts through the back without drilling on site, and they give you adjustment along the run. If you want an unbroken back for appearance or for a continuous seal, order the plain-back version of the B12 channel rather than the SH.

No. It is the bare 120 inch channel stick only, one model, B12SH-120AL. Spring nuts or channel nuts in the size your bolt requires, the bolts themselves, plus any brackets, beam clamps, post bases or end caps are separate line items. For an aluminum run, specify stainless or aluminum-compatible hardware so you are not pairing dissimilar metals in a wet location.

If the existing run is B-Line B12 profile, yes, the section is the same: 1.62 inch width and 2.43 inch height, so fittings and nuts transfer between old and new runs. The difference to check is material. This is the aluminum version, so if the existing channel is galvanized steel you will have an aluminum-to-steel joint at the splice, which is worth isolating or fastening with stainless in damp areas.

Order Eaton B-Line B12SH-120AL. Read as: B12 channel type, SH slotted hole pattern, 120 inch length, AL for aluminum. Changing any one of those letters changes the part, so if a drawing calls for plain back or a different length, the suffix will differ.

Yes. Aluminum 12 gauge strut cuts cleanly with a chop saw and a non-ferrous blade or a portaband, which is one of the practical reasons crews pick aluminum over galvanized steel for field work. Cut ends are raw aluminum, so deburr the slot edges before sliding a strut nut past them. Note that cutting through the SH slotted back can leave a partial slot at the end, so plan your cut against the pattern if the end hole is carrying a fastener.