Rapid Tools RT00003 Serrated Blade for Utility Knives, 5-Pack serration pattern make the blade sharper, last longer and cut more evenly through formidable material independently tested and rated the #1 blade against other national brands on fit any standard utility knife so you can use them in your favorite knife or in any of the Rapid Tools&#8217; line of quality utility knives available The only blade you will ever use again, as the difference between the patented serrated blade and an ordinary straight edge is simple a cut above