Pearl launch --- There are a lot of them. But for me, the diameter is 9mm.
extreme session of BDSM : slut strav suspendet and 3 insert in ball
Brasil Urethral Sounding with screwdriver #3 (inserts in comments)
Slow motion steel ball chastity cage and shower head cock plug
These two Adventurous Shemales use the same Rod with 2 Dicks to do their Sounding