This handy gauge fits most vise
stems. To determine hackle size,
simply bend the hackle around the
pin at the bottom of the gauge. The
hackle will flare out and the tips
will indicate on the curved graph
the correct size hackle.
To determine hook size simply place
the hook on the hooks pictured on
the gauge. This gauge will rotate
freely on the vise stem so it may be
swung out of the way when not in
use. It will correctly identify size
4-22 hackles and 4-16 hook sizes.