Roof truss spacer?

[Kenton H. Shepard, CMI]

It doesn't look adjustable for width, so that center bolt looks like it's there to anchor an eye-bolt. Sometimes they'll build the whole roof on the ground where it's easy, then have a crane lift it right up and set it on top of the house. Was this the only one or were there more? like... 3 more.

Where OSHA has any force, or where insurance rates are high (or employees scarce) they install lanyard connections even on roofs which aren't steep.