for rack panel connections this is handy cover to tidy and some degree protect the wires on the back of the panel. is it necessary? not really, but it certainly doesnt hurt and its not the biggest outlay youre ever going to make. happy i got it but could easily live without it too.
Yep, work nicely on the back of a Neutrik speakon. Tough and plenty long enough for speakons and XLRs. Easy enough to slice off an entry hole for the cable (if required). The plastic is a good thickness, not some thin stuff that would tear easily.
Recommended to tidy up your installs at a reasonable price.