Contains Replacement blades for Handi-Cut 37301 came with your original Handi-Cut knife. You can make clean cuts through all of the usual materials, such as cardboard and plastic. These are 4 in. blades, so you get more cutting surface than you would out of a typical box cutter or exacto knife. This blade will cut through bigger pieces in less time. The Craftsman replacement blades exacto come in a set of 5. You can replace your blade and keep four backups in your toolbox for the next time you find your Handi-Cut is getting dull. All of these blades are constructed of industrial carbon for a strong tool with a sharp edge. They will last if you store them safely away for the future in a dry place, such as in the handle of your knife.Craftsman replacement blades for 37301 are 4" long for cutting both large and small piecesEvery replacement blade is made of industrial carbon steel for strengthBlades come in a package of 5 so you have several sparesReplacements fit the 3-7/8" steel frame Handi-Cut model 37301Will slice through materials like rope and leather thanks to scissor design and sharp bladeBlades fit in a storage compartment in Handi-Cut handle