FC Folding Pocket Utility Knife - Heavy Duty Box Cutter with Holster, Quick Change Blades, Lock-Back Design, and Lightweight Aluminum Body - - Amazon.com
Shakespeare Blade Metal 1 Trimmer Head and Installation Kit in the String Trimmer Heads department at Lowes.com
Mini Circular Saw, ENVENTOR 5.8A Compact Circular Saw Corded with Laser Guide, 3500RPM with 6 Saw Blades 4-1/2" Max Cutting Depth 1-11/16"(90°),1-1/8"(45°), Ideal for Soft Metal, Wood, Tile - - Amazon.com