I use this in my gerbil tank. There is no attachment for hanging but I think the piece we received is too large/heavy to attach to a cage.

Grapevine can mold in wet conditions. As you likely know, hermit crabs need around 80% humidity so I wouldn't risk using this.

Scrub with vinegar and water mixture then bake at 300 for 10-30 min or until totally dry. Vinegar and water is a good natural cleaner that will be non-toxic to animals, unlike soap or bleach. 

Under "Attributes/Specification" it states: Length 18", Height 10", Width 6".

The Grapevine Jungle Gym is approx 5 inches tall at its highest and approx 9 inches wide and approx 10 inches long.  

I don't know-I bought mine for my bird-it is a bit large for him-so I put it on a shelve on my balcony with English Ivy trailing around it.

Oh my goodness yes yes yes you will need to completely submerge them in water for up to five days so it will soak up water and sat on the aquarium bottom.  They have wonderful wood to work with . Get the logs for 15.95 they are bigger than the gym and every one different. Enjoy!!!

I purchased one for my 2 parakeets and they love it. Keep in mind that these are made of natural materials so each one will be different. Mine is flat at one end but I was afraid it would fall over when one of the birds jumped on it. I've laid it down which works good. I do still prop on end of it against the side of the cage just to be on the safe side. I hope this helps you. I waited frogs every year from frog eggs to frogs. Drove my parents nuts but the would walk down in the woods near our house and find a spot where there was a puddle big enough for frogs to lay eggs. I wish I had one of these back then because i know the frogs would have loved it and the frogs need a place to get out of the water and this is perfect.

My daughter who works at a pet store thinks that this is would be too small for a dragon of that age and size.

Yes, it has lots of texture and varied shape within the structure which I am sure a gecko would enjoy.  It is also a natural product so no safety concern over chemicals, paint, etc. My daughter, as part of her job, has great success in feeding geckos when they are perching and basking on it.