Securely fixed with muscle knots It is difficult to change the angle while working. The rod is thick and can be used as a round saw guide ruler. It can be moved on either the left or right side of the rod, so it is easy to align symmetrically. You can read the scale and see the angle. (Comes with a tape to write in angles) If you are injuring the desired angle to the processed material or to photograph any angle. Total Length: 25.8 inches (655 mm); Width: 1.2 inches (30 mm); Thickness: 0.8 inches (20 mm); Nominal Dimensions: 23.6 inches (600 mm); Angle Scale: 1° Pitch: 20 - 120°); Body: Aluminum; Screw: Brass; Washer: Plastic; Country of Origin: Japan.