Blade for Challenge 37 TCM Challenger paper cutters, standard inlaid high speed steel (AKI-IV) by Alliance Knife Company. This blade measures 44.50" long x 5.000" high and .431" thick, with 12 holes. (Challenge I.D. is 9-142-1.) When ordering knives, please double-check the brand, model and serial number of your cutter, and measure your knife carefully.