Stone Tools ST-91 12-Inch TPI 24 Bi-Metal Hacksaw Blades, 10 Pack Bi Metal Matrix II cutting edge Tooth hardness RC 65-67 Shatter Proof , Flexible and Shock Resistant 8-Inch Cobalt in cutting teeth brings extra toughness to steel cuts Ideal for cutting pipe, tubing solids, steel, wood and plastic. Made in USA