I am guessing you are thinking of a Lifesling:
https://www.westmarine.com/buy/lifesling--lifesling2-overboard-rescue-system--357634

Alexis

On Wed, Dec 2, 2020 at 4:47 PM Tom Van Heule <
tom.vanheule at intrinsicprograms.com> wrote:

> I don't know what to call it , life ring, kit, flares, gps, etc in a square
> bag that I see lots of boats have mounted on stern rails? What is this?
>
> On Sun, Nov 29, 2020, 9:35 PM JeffSmith <jeffsmithphoto at gmail.com> wrote:
>
> > Alex,
> > My side decks are solid glass at least 1/2" thick, so I  drilled 3 holes,
> > sealed with butyl tape and backed with 2 fender washers.
> >
> >
> >
> > -----
> > Jeff Smith
> > 2009 R22 #101 RADIANT
> > Atlantic Highlands Municpal Harbor
> > Atlantic Highlands, NJ
> >
> > --
> > Sent from: http://rhodes-22.1065344.n5.nabble.com/
> >
>