Detachable and Multipurpose: The ruler can be disassembled and used individually or in various combinations, providing flexibility in your measuring and marking tasks. Woodworking Marking Angle Ruler: This ruler is a versatile tool, serving as a T-square, protractor, angle measurement device, dovetail marker, and more, making it ideal for various marking needs in woodworking. Measuring from 10-90° and Fixed Angles: This ruler allows you to mark angles between 10 and 90 degrees with ease. It also includes fixed angles at 30°, 45°, and 60°, catering to a wide range of marking needs in woodworking. Locate the Center: Use the triangular piece to snugly fit around a cylindrical object's outer circumference. Marking lines at 45°, the intersection of these two lines will indicate the center of the cylinder.