2, Hole design, the ruler can be marked at an angle and the hole in centimeters is convenient for marking. 3, Handle anti-fall, hands without walking. 1. Handle of high quality aluminum alloy, high corrosion resistance, light and stable 4. Insert the needle to draw lines into the angular hole, and the included angle between the needle for drawing lines and the Handle parallel to the desktop is the angle marked by the angle hole., Manufacturer: Bumdenuu