This is an Excel Mitre Box. This aluminum miter box allows you to create precise right or left hand 45° angles, as well as perfect 90° cuts. Package includes hardened serrated steel blade that is perfect for plastic, wood, and soft metals. Blade measures 1.00 x 5.00 x .012" 42 Teeth/Inch (2.5 x 12.7 x .03cm 16.5 Teeth/cm). Also includes Excel K5 handle.