Angle One-Shot (Aluminum) AOS-01 : Angle Finder, Angle Duplicator, Goniometer, Angle Measuring Tool Measures both outside corner and inside corner (miter angle from 25 to 90) Transfers the angles to your miter saw for miter cuts (crown molding, baseboards, and etc). Has indications to geometric shapes from pentagon to octagon (5,6,7, and 8). AOS-01 can be worked on sliding miter saws only because it has a longer guide bar. Made in Korea. More information and instructions can be found at www.angleoneshot.com