Renzetti Double Ended Hair Stacker- Standard- Hair stackers are used to align the tips of hair cut from a hide. The Renzetti Double Ender Hair Stacker has an aluminum base and 2 brass barrels. One barrel is 1 3/4" long with an inside diameter of about 1/2". The other brass barrel is 1 1/2" long with an inside diameter of just over 1/4". These barrels are smooth to allow the hair to slide easily. The aluminum base has rubber pads on either end to protect the table. Made in the USA.