The Mayes Squangle 10231 is the ultimate multi-tool solution; its 10-in-1 design offers the features of a rafter angle square in an easy-to-use package. With aluminum blade, thumbscrews for angles from 45° to 90°, a virtually indestructible level vial, and high-impact composite polymer slide arm, you'll be able to tackle any job with confidence. Made in the USA and comes with instructions.