Irwin Folding Utility Knife, Features Quick Change Button That Is 25% Faster, Also Features Wire Stripper Notch, A Wide Thumb Ledge, Integral Belt Clip & Rugged Industrial Design, Includes: 1 Irwin Blue Blade, Blue Blade Are Bi-Metal, Utility Blades, Patented Bi-Metal Technology Blade Is Shatter Resistant, Stays Sharp 3 Times Longer Than Carbon Blades.