In article ,
says...
I've got a pair of the anti-kickback wheels on my rip fence. They hold
the board in place while I walk around to pull it through. No way is
that board going to pull my hand into the blade, the wheels only allow
about 1/4" of backward movement.

I once considered those, but I do too many narrow ripping operations for
a push stick to clear the wheels. Otherwise they look like an effective
safety addition to a TS.

Mine just clamp onto the rip fence, so it's fairly easy to
remove them when required. A lot of times I just flip them
up.

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BNSF = Build Now, Seep Forever