This is a jig to install an align vanes on arrow shafts. There are three pieces, the jig base, vane holder and index knob. The index knob has three magnets 0.25 x 0.1in and the base has one of the same size and all epoxy glued in place. I use it all the time and it works well and much less expensive than the commercial jigs. I use spring clamps to hold it in place for about 15 to 20 seconds while the CA glue to sets.

ENJOY.