Frame Conectors instructions

I have a set of MP "Bolt on" Frame Connectors.
They have been setting in the corner of my garage for many a years. Pulled them out the other day and there are no instruction with them.

It says bolt on,(comes with a bag of bolts) but it look like I will be make some holes in to these to make them bolt on..........Am i missing something?

How have you Installed these?