I have a couple of those cables also. Not sure where I got them. I used to have Comcast but now have ATT UVerse, so I think I got them from Comcast.
I like them because the grip is large enough that hand tighten is actually adequate for the task. No tools required.
I just spent about 30 minutes searching via Google and could not find them.
My cables say E233771 6 series and the connectors say TFC. But using that as search keywords was not successful.
Wayne in Coarsegold near Yosemite
2013 Forest River Solera 24R
2014 Jeep Wrangler Rubicon
ATV trailer for the following toys
2008 Yamaha WR250R,2009 Honda CRF150F
2008 Polaris Scrambler 500