5 Pack, Bimetal, Utility Blades, Patented Bimetal Technology Blade Is Shatter Resistant, Stays Sharp 3 Times Longer Than Carbon Blades.
Blue Blades, 50 Pack, Bimetal Utility Blades, Patented Bi-Metal Technology Makes Blades Shatter Resistant & Keeps Blade Sharp 3 Times Longer, Also Includes A Dispenser That Easily Dispenses 1 Or Multiple Blades.
5 Pack, Patented Bi-Metal Safety Utility Blades, Irwin Patented Bi-Metal Construction Features Unbreakable Blades Are Safer To Work With, Last Longer Than Traditional Utility Knife Blades, Blunt Tips On Safety Blades Reduces The Risk Of Puncture Wounds But Still Allows For Penetration Of Surfaces.