A hair stacker is used to align the tips of hair cut from a hide. The Magnum hair stacker has aluminum base and 1” brass barrel. The Brass barrel is 1 3/4" long with an inside diameter of 3/4". This size works well with fly tying materials like elk hair, deer hair and calf body hair to tie large trout streamers and small deer hair flies. If you tie Muddler Minnows, Stimulators or trout streamers with hair wings the Renzetti Magnum Hair Stacker is a good choice for your fly tying tool collection.