A hair stacker is used to align the tips of hair cut from a hide. * Standard hair stacker has aluminum base and 1 brass barrel. The Brass barrel is 1 3/4" long with an inside dia of 1/2". * Midge hair stacker has aluminum base and 1 brass barrel. The Brass barrel is 1 1/2" long with an inside dia of 1/3" * Double Midge hair stacker has aaluminum base and 2 brass barrels. One brass barrel is 1" long with and inside dia of 1/8" and the other brass barrel is 1 1/8" long with an inside dia of just just over 1/8". * Double Standard hair stacker has a alum base and 2 brass barrels. One is 1 3/4 long with an inside dia. of about 1/2". The other brass barrel is 1 1/2" long with an inside dia of just over 1/4". These barrels are smooth to allow the hair to slide easily The aluminum base has a rubber pad to protect the table.