Starrett Bi-Metal Unique Safe-Flex Hacksaw Blades 300mm (12in) x 32tpi Pack 2. Precision ground, super-efficient bi-metal blade for a faster and longer-lasting cut on tough materials. The high-speed steel cutting edge is welded to a tough alloy steel back, providing optimum tool life and high resistance to breakage. Blade cross section: 13 x 0.65 mm (1/2 x 0.025 Inch). Blade length: 300mm (12in). Contains 2 x Starrett Bi-Metal Unique Safe-Flex Hacksaw Blades.