Amana ZrN Carbide Cone BurrAmana ZrN Carbide Cone Burr The Amana ZrN Carbide Cone Burr with non ferrous flutes is designed for cutting all non ferrous and non metallics, such as aluminum, wood, plastic, zinc, bronze, copper, and more. The aggressive carbide cone provides very little chance of plugging the flutes. The steel shanks are definitely in a class of there own. The solder joints are clean with no excess gaping out from the sides between the carbide bud and shank. You