Description: Easy Storage: The wings fold in can conveniently store in tool box, work bench, or pocket or tool belt! Perfect Angle: Angle tool is specifically designed to ensure that miter cuts are at the perfect angle. Even works on outside angles. Measure, Lock, and Transfer: Use the tool to measure the exact miter angle you need, then lock it, and transfer that exact angle to Miter saw. The Miteri divides the angle in half for a perfect miter. Works With Any Angle: Measures internal or external angles from 0 - 180 degrees (miter angle from 0-90 degrees). Angle Replication Made Easy: Remove alloy measuring wing from 1 side and place the other side against the fence of your miter saw and turn your blade to match the angle of the plastic body of the tool. This will replicate the angle that you measured exactly! Specification: Material:  Alloy Size Chart: 16.5cmx4.6cm/6.50inchx1.81inch Package Includes: 1 Miter Saw Protractor  Note: Please allow slightly errors due to manual measurement and different monitors.