Stop in for a cup of coffee

Yep I see a few things in the pic that I'm not sure of their use. Like the ruler with a bracket of some sort??
Lucky me I have a tool man for a neighbor. Any other questions a MOPAR buddy works tool section at Lowes.
I'll figure it out.
I don't have that or the flex line. Think it might fit on that.
Some sort of guide..
Circle jig maybe.