Blade for Challenge 32 1/2 Diamond paper cutters, standard inlaid high speed steel (AKI-IV) by Alliance Knife Company. This blade measures 38" long x 4.500" high and .375" thick, with 14 holes. (Challenge I.D. is 6-142.) When ordering knives, please double-check the brand, model and serial number of your cutter, and measure your knife carefully.