Barnes style dehorners made by Moore Maker INC., in Matador, Texas. Moore Maker holds the patent on this dehorner, and they feel it is the best tool of its type available. The size 1 is for newborn calves, the size 2 is for calves up to 200#, the size 3 covers calves 200# to 350#, and the size 4 is for calves 350# to 500#.