Ordered one of these last night. I've been looking for something that does the same thing as "The Key" on my Schaller/JT-590 style bridges for fucking ever. Suppose this is a relatively new product. Haven't seen it before. Ibanez has a similar tool that looks awesome, but it's only designed for edge style baseplates with non parallel planes of the "main baseplate" and "fine tuner screw" shelf area.
I fucking love "The Key", great tool, but I stick to four types of bridges on guitars Schaller OFRs/JT-590s, TOMS, Kahlers and OFRS. The majority of bridges have been JT-590s in my collection since forever. The Key only works on OFR style bolts, and I prefer the Schaller Design and prefer buying older Jackson/Charvel guitars with the Schaller design, so this is a welcome new product.
Dunno whether it will beat "The Key" for OFRs, will have to wait until it shows up. Different sort of design than The Key. Could be better, could be worse. The Key pull back from the bolt and this one wedges in the actual saddle, since there is no where to "grab" on the fat Schaller style bolts.