These are a little different in that they are not really meant to repair a hole. These are made to create a bolt on position for anything you need to bolt on.
Lets face it, its pretty hard to tap a .120 wall tube and having a bolt on position wherever you need makes these too easy. Every Fab Shop could use 100 a week if not more!
These come in 3 bolt sizes (5/16", 3/8", & 1/2" Fine Thread) and packages of 6. They fit into a 3/4" drilled hole so they are good for down to about 1 1/4" tube or any flat plate. This picture shows the 3 different sizes mounted in a 1 1/2" tube.