Logan 424-1 Team Cutting System Plus For Acurate Mat Cutting Plus Mat Knife With 24 Inch Straight Edge Retractable blade for added safety with included mat cutter and 24 inch straight edge Unique start - stop indicator helps prevent over-cutting of material-great for students and professionals Patented blade slot and Adapt-A-Rule straight edge-safer and easier to use Helps you make straighter - more accurate cuts for mat cutting, framing, design and technical projects. Can be used with Logan glass cutter or straight cutter as well.