This can fit a 16” OD tube diameter eg possibly a C14; Planewave 12.5”; RCOS 12.5” or newts of course. The max OD tube that this will fit is 415mm. The nylon thumb screws reduce the size by 1”. The allu is think/strong. I purchased masks on this forum before (plastic) and they cracked like holy communion...
Pickup preferred Canberra or Yass (I’m also going through Syd and central coast next week).
$100 pickup (shipping extra if I must...)
http://spike-a.com/#
