Blopblip

I think I've seen it on Aliexpress before, probably called massage glove or sleeve.

I'm looking for a plug/tunnel in medium to large size and been looking at the Perfect fit http://www.extremerestraints.com/butt-plugs_1/perfect-fit-tunnel-plug_6734.html and Black hole http://www.meo.de/catalog/product_info.php?cPath=187&products_id=9376. Also been looking at these Stretching ring from Meo http://www.meo.de/catalog/product_info.php?cPath=187&products_id=8616 but I feel it's probably more comfortable with a plug in soft rather then hard material if using during longer periods. Any opinions, which would you prefer and why? :)

Sounds very interesting with both expanding, auto expanding and the digger! I wish I had access to a well equipped workshop! I own a similiar the lockable ones displayed, model "A", and some one asked about pinching. I always use a condom on mine so I've never experienced any pinching. The plug it self is very nicely done with high quality steel and it sure weighs a bit. Very sturdy and an impressive piece. Only downside is that as I would consider myself as an advanced anal player, who can take up to a soda can, I think it's to small. It's no problem for me to push it out fully expanded. It would be really nice if that would be impossible and the only way to get it out was to open the lock with the key and than close the plug.