Features:The straight ruler is made of plastic, sturdy and durable, not easy to deform or damage, suitable to serve your repeated uses. Can be used as an angle parallel ruler, straight line, horizontal parallel line, arc measurement, etc. Can be used as a protractor, 0-180 degree angle measurement or scribing (1 small grid 5 , a large grid 15 degrees, the angle displayed by the dial, is the degree of opening of the ruler). The tip of the angled disc in the middle of the disc is the center point of the circular arc, which can draw a circle or arc of 4-30cm diameter. Put the ruler vertically, open the ruler 90 degrees, pull down the right scale in parallel, and draw a uniform parallel line. Open the ruler to a 30cm scale and draw a straight line. Straight Ruler ionly, other accessories demo in the picture is not included. Specifications:Item Type: Straight RulerMaterial: PlasticSize: approx.30cm/11.81inColor: As Picture ShownQuantity: 1 PcPackage Includes:1 x Straight RulerNote:Transition: 1cm=10mm=0.39inch. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.