Rapid Tools RT00004 Serrated Utility Knife Blades, 10-Pack serration pattern make the blade sharper, last longer and cut more evenly through formidable material Independently tested and rated the no.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