This hitch extension is &#34;adjustable&#34; because it has two holes on the &#34;male&#34; end of the receiver, and two holes on the &#34;female&#34; end.  Depending on how you insert this extension into your vehicle (hole one or two), and how you insert your bike rack or whatever else into the &#34;female&#34; end (hole one or two), there is some adjustment on how much extension you achieve.  In theory.I was hoping to use the SMALLEST amount of extension with this so that I'd achieve about 7&#34; of extension.  I needed to extend my Thule T2 bike rack just enough to clear a larger-than-factory Jeep tire.i am able to use the hole that positions this extension furthest into my Jeep (so the &#34;male&#34; of this extension is adjustable).  Unfortunately, I was not able to utilize the deepest hole in the &#34;female&#34; end of this extension because there is only about 2&#34; of space between that deeper hole and an internal ridge where the inside square bar is welded to the outside square bar.  Hard to describe, but essentially my Thule bike rack it the back of this extension before the holes lined up with the deepest hole in this extension.So.. I suppose you could blame that on my bike rack?  In hind sight though, I wouldn't trust any bike rack that only had that little amount of metal behind the holes--just not enough there to handle the load.  No.. I think that this extension could have been better designed to just have ONE hole on the &#34;female&#34; end, but position it somewhat in-between the two that it currently has.  I doubt that there are many racks out there that could utilize the deepest hole in this extension's &#34;female&#34; side...One additional comment.. I read some reviews that criticized the welds.  I am not a welder, but in my observation, the welds seem smooth and uniform all the way around this.  I must say that the metal is a little thin compared to other extensions that I've seen.  I think it's quite fine for any 2-bike rack out there, and I'm using it for that.  When I set up to carry 4-bikes, I do worry that this may snap though, and I am pursuing another extension for that reason.Conclusion:  If you are only carrying 2 bikes, and you are happy with the extension possibilities IGNORING the deepest hole in the &#34;female&#34; part of this extension, I recommend it.  The price is reasonable and the integrated locking bolt is really nice (especially if you buy their optional locking bolt.)If you want a very short extension, this probably won't work.If you plan to carry 4 bikes, I don't know if this is strong enough.  I'm using it for that occasionally, but I'm a little worried about it...