B-Line Eaton series strut channel, 1.62" channel height, 240" channel length, 1.62" channel width, Steel, 14 Gauge, S hole pattern, B24 channel type,

Pre-galvanized (mill galvanized) steel is an indoor and protected-location finish. It handles damp mechanical rooms, parking structure interiors, and general building service fine, but sheared ends and field cuts leave bare steel exposed, so for sustained outdoor exposure, coastal air, or wash-down areas you want hot-dip galvanized or stainless strut instead. Touch up cut ends with a zinc-rich paint if you cut this in the field.

S is the standard slotted pattern: elongated slots punched through the back of the channel on regular centers, which lets you through-bolt to structure and adjust position without drilling. If you need a solid back for a cleaner look or to avoid punching through into a wet area, that calls for a plain (no hole) channel instead.

Order Eaton B-Line part number B24S-240GLV. Read it as B24 channel type, S slotted hole pattern, 240 inch length, GLV pre-galvanized finish. If a drawing calls out a different suffix, that is a different finish or hole pattern, not this stick.

Yes, and that is the usual reason to stock the back-to-back 1-5/8 section: the same 1.62 inch slot takes electrical conduit clamps and plumbing pipe clamps, so one channel and one family of spring nuts covers electrical, HVAC, and plumbing hangers across a building. Buying it in 240 inch sticks also reduces cut waste on long corridor runs.