Starrett Hack Saw Blade - 12", 24TPI, 10-Pack Bi-Metal Unique High Speed Steel Safe-Flex Hand Hacksaw Blade 300mm / 12" 24TPI 10UN. Features include... A patented solid state diffusion process produces the industry's most advance bi metal hacksaw blade. Massive increase in tooth strength and reduction in tooth breakage and fracture when compared against tradition bi-metal blades. Excellent for interrupted cuts in cramped places or where the blade is subject to bending or twisting stresses. 10 Blades per pack Specifications include... Material Cutting Section (mm): 3 to 11mm Material Cutting Section (in): 1/8" to 7/16" Teeth Per Inch (TPI): 24 TPI Dimensions LxWxT (mm): 300 x 13 x 0,60mm Dimensions LxWxT (in): 12 x 1/2 x 0.024"