Limit: Equipped with a limit marking function to ensuring that the ruler does not slide during marking, maintaining the accuracy of the marking Fixed point marking: Equipped with a fixed-point marking function, it facilitates marking on wooden boards Clear and horizontal bubble: Built in horizontal bubble, accurate measurement results, leveling multi angled marking at 15°, 30°, 45°, 60°, and 90° to meet the marking needs of different angles Rotatable knob: The rotary knob design facilitates adjusting the angled and position of the ruler, and is fixed at the desired angled and position, Manufacturer: OSNIYAW