Irv, thanks for pointing these out.
With a new amp that has binding posts a little too short for the bananas I was using*, and the abysmal quality of those bananas* generally, I ended up buying 2 packs of these spades to fill out a 5-channel system.
They do in fact have a sawtooth end on the compression fitting. (As do the half-again-as-expensive
GLS ones.)
It's a clever solution that seems to offer a great connection and does not require any tools. The only wire-capture system I like better is the lever-tightened-by-a-screw design used on Neutrik Speakons.
Overall, they seem at least equal to the quality of the Monster ones. If anything maybe a bit better, because they have more surface area (no grooves cut into the spades) to provide electrical contact. Like all such compression fittings, they won't work with solid core speaker wire. Hopefully nobody's using that, because it's generally a bit fat pain. (Though often easier to run through walls. And with solid core wire especially, I see no need for anything but perhaps tinning the end and running it through the crossdrilled hole on the binding post.)
*"Nakamichi" with "BFA" sawtooth ends. Every single one I removed from the back of the Anthem MRX 300 had a kink in it corresponding to the end of the binding post. Needless to say, I will not be buying more of those. Pity, because I like the double set-screw wire holder.