Starrett Red Stripe HSS Hacksaw Blades 300mm (12in) x 24 TPI Box 50Uniformly hardened throughout, they hold the edge when cutting difficult to machine alloys, maintaining straightness of cut. Ideal for use when the workpiece is held securely and the blade is not subjected to bending and twisting stresses. Blade cross section 13 x 0. 65 mm (1 2 x 0. 25in). Length: 300mm (12in) 50 ; x Starrett Red Stripe HSS Hacksaw Blades 300mm (12in) x 24tpi