Features: The marking ruler is good for engineer, architect, carpenter,student, draftman, and so on. The smallest scale is accurate to 0.25 mm/0.0098 in, making the marking more accurate. The vertical scale on the rightmost side of the ruler and the corresponding flat holes are used to draw horizontal markinglines, with an accuracy of millimeters. Using the upper and lower edges of the ruler and the scale on it,horizontal marking can be completed.Insert the pen tip into the small circle corresponding to the scale,and move the scribing ruler backward or forward with both handsto complete the vertical scribing. brand new and high quality The marking ruler is made of stainless steel, and the scale is clear at a glance. Specifications: Material:Stainless Steel Ruler Range:180 mm/7.08 in, 200 mm/7.87 in, 300 mm/11.for 81 in, 400 mm/15.74 in Ruler Thickness:0.3 mm/0.0118 in 180mm Ruler:Total Length:200 mm/7.87 in Total Width:29 mm/1.14 in Foot Width:21 mm/0.82 in 200mm Ruler:Total Length:248 mm/9.76 in Total Width:108 mm/4.25 in Foot Width:50 mm/1.96 in 300mm Ruler:Total Length:348 mm/13.70 in Total Width:108mm/4.25 in Foot Width:50 mm/1.96 in 400mm Ruler:Total Length:449 mm/17.67 in Total Width:108 mm/4.25 in Foot Width:50 mm/1.96 in Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3.All the rules are only 0.25 mm thick and must not be used for roughing. 4.The ruler body is soft, please do not bend. Package includes: 1 Piece High Precision Marking Ruler