Standard Retractable Knife, With 1 Blue Bi-Metal Utility Blades, Optimized Cutting Angle For Reduced Fatigue, Smooth 3 Position Slide Exposes Variable Blade Lengths, Inside Storage For 5 Blades, Screw Permanently Captured In Casing To Prevent Loss, Blades Are Shatterproof & Stay Sharper 3 Times Longer Than Standard Utility Knife Blades.