512721-30. Carbide Tipped Aluminum and Non-Ferrous Metals 12 Inch Dia x 72T TCG, -6 Deg, 30mm Bore. Thanks to its special carbide formulation and blade geometry, this is the ideal blade for cutting relatively thick-walled aluminum and non-ferrous metal bars such as copper, brass, bronze and lead. It also is good for cutting extrusions and profiles. The negative hook angle (-6°), triple-chip grind and thick plate combine to produce a superior finish. The blade can also be used to cut other “difficult” materials such as plastic, PVC tubing, fiberglass and ACM (Aluminum Composite Material).