The Hackle Gauge helps to choose the hackle orhook size quickly and easily. Just bend an hacklearound the plastic pin and read the appropriate hooksize on the curved scale. The graphic clearlyindicates the sizes of the hooks from 4 to 22 and thecolors of the curved scale allow a good view with bothlight and dark hackles. It can be applied directly to the
vise stem and can be rotated when not in use.