12 Inch 18 TPI Bi-Metal Hacksaw Blade Set includes 2 hacksaw blades that will fit most standard 12 and adjustable frame hacksaws. The flexible bi-metal blades are constructed for heavy-duty cutting and extended blade life. This shatterproof blade set is virtually indestructible. Bi-metal steel for increased cutting performanceFits most standard 12 in. and adjustable frame hacksaws