I’m not @ home right now, BUT the instructions show how to orient it to center the 5/16 and 1/4 holes.
No. The jig must be held flat against the drilled wood. Cannot handled angles.
Yes but you need to buy metal drill bits since the one it comes with are for wood.
Minimum is 1/2 inch. The jig gets turned to center it using the diagonally opposing posts
I had to order mine online. In-store pickup was free.
It's works great on .5 inches that's what I use mostly but I just did a project with 3/4 and it did just as good