What is this lifting spreader called

Spreader.

Or spreader bar sometimes.

It is a spreader bar for a crane or overhead of some sort to pick up something that is wide.

The cranes around here have a set of them of a number of sizes -

Check Rigging.com :

Notice the pictures on the bottom of the page.

That bar is set for a specific width. You want a down drop of cables not a diagonal.

Sometimes they use three. Two under a wide one giving 4 pickups over a longer area than the two on the top one.

Mart>

Thanks. This one, was used for lifting boats out of water

I've heard them called a "strong back" in other industries.