Product Description ------------------- The CH Hanson Angle Snap is a unique layout tool which takes the guesswork out of marking plywood, drywall, OSB or other sheet goods. The angle snap works with any standard chalk line; simply slip the line into the mount, set the angle snap on your starting edge and run the line out. Easily measure angles and roof pitches by using the angle snap as a protractor. From the Manufacturer --------------------- Take the guesswork out of marking plywood, drywall, OSB or other sheet goods. The angle snap works with any standard chalk line, simply slip the line into the mount, set the angle snap on your starting edge and run the line out.