Starrett Heavy Duty Hack Saw Blade - 12", 18TPI, 10-Pack Bi-Metal Unique High Speed Steel Safe-Flex Hand Hacksaw Blade 300mm / 12" 18TPI 10UN. Specifications include... Material Cutting Section (mm): 5 to 13mm Material Cutting Section (in): 1/8" - 7/16" Teeth Per Inch (TPI): 18 TPI Dimensions LxWxT (mm): 300 x 16 x 0.80mm Dimensions LxWxT (in): 12" x 5/8" x 0.032"