Trapezoid Retractable Knife Trapezoid Retractable Knife 2 Three-position slide for multiple cutting depths. Captive Screw prevents loss during blade change. Magnet holds working blade in place. Highly durable, lightweight body. 12 4x 34 [4] [2] Trapezoid Retractable Knife [6] FEATURES [5] 1. MAGNET holds working blade in place [3] 2. THREE-POSITION SLIDE for multiple cutting depths 3. OPTIMIZED CUTTING ANGLE to reduce fatigue [1] 4. CAPTIVE SCREW prevents loss during blade change 5.