Multi-key clock winders.
The two 'spiders' each have five sizes. One has odd sizes 3 - 5 - 7 - 9 - 11; the other has even sizes 2 - 4 - 6 - 8 - 10. There is also a 'star' winder for extra-large sizes, guaranteed to fit any longcase clock, sizes 12- 14 - 16 -18.
Not sure which size? Measure the edge of the winding peg and click here for a conversion chart.
If you want to be certain that you have every size, buy all three.
The idea of these is not actually to wind the clocks, it is to see which size you need, then buy an individual key. Of course, if it fits without catching on the casing, then why not use it for winding?