Great stops for slowing kickback from the saw. Also useful if you are plunging into the middle of a piece (not starting at the edge) to prevent jerking that sometimes happens when the blade gets through the material and you haven't let up on the pressure.
This little guide rail attachment helps prevent the TS55/75 from kicking back (or, halts the saw if a kick back occurs). There's not much to it, not much to write about. But if you're a safety nut like me, you'll love this little knob. It easily tightens to guide rails and you're ready to saw, that simple. And the price it unbeatable.