This is a compact and low cost wrench that's useful for removing and installing pieces that you reconfigure often, or for just helping you hold opposing parts during assembly.
You can use these over the top of your bolts and nuts as wrenches, or you can permanently install them by running them in reverse and using a spot of glue.
This fits 1" nuts and bolts with a 1-1/2" head. This size is commonly used in the Rogue Fitness Monster series.
Sold as a pair.